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A mathematical statement that indicates that the value of the LHS is equal to the value of the RHS is called an equation.

An equation puts a condition on the variable. The value for which the equation is satisfied is the solution of the equation.
e.g. The equation n 15  = 3 is satified for n = 45.

The value of the variable in an equation that satisfies the equation, or makes its LHS equal to its RHS, is the solution. An equation can contain numbers and variables. 
e.g. a - 2 = 30 ⇒ a = 32.

An equation is said to be an algebraic equation if it consists of a variable. 
e.g. 20x = 400.

A single variable equation will have a unique solution.
e.g. 15n = 225.

An equation that does not have any variable is called a numerical or an arithmetic equation. 
e.g. 17 × 2 = 34.

Different numerical values for the variable are substituted in an algebraic equation, and the solution is obtained by using a method called the trial and error method. If there is no sign of equality between the LHS and the RHS, then it is not an equation.

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1 . find the value of x



it is 22/7.. i think you should know this in class 6 :P

3 . Mark scored by Shveta are 10 more than twice the marks scored by Reena.

Marks scored by Reena=x. 10+10=20. ( R)=20x Therefore Sheva's marks=20x. 10+2x=29

4 . What is algebra

Algebra is the branches of mathematics. It consists of variables and numbers. e.g 2m

5 . dear maam , if the question is - show expression , v multipied by -8 then subtracted from 26 ? ans is 26- -8v ? but the variable always comes before ??

This can also be written as 8v+26.(commutative property of addition)
But I am a boy not a girl.