Question

7+5x-3x=21 solve the problem

Answer 1

7+5x-3x=21
7+2x=21
2x=21-7
2x=14
x=14/2
x=7 is answer obtained

Answer 2

Hi !!

7 + 5x - 3x = 21
or, 7 + 2x = 21
or, 2x = 21 - 7
or, 2x = 14
or, x = 14/2 = 7

Check :

LHS :-

7 + 35 - 21
= 7 + 14
= 21

RHS :-

21

THEREFORE, LHS = RHS.

HOPE IT HELPS :-)