7x-8=21-8

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Solution for 7x-8=21-8 equation: 


Simplifying
7x + -8 = 21 + -8

Reorder the terms:
-8 + 7x = 21 + -8

Combine like terms: 21 + -8 = 13
-8 + 7x = 13

Solving
-8 + 7x = 13

Solving for variable 'x'.

Move all terms containing x to the left, all other terms to the right.

Add '8' to each side of the equation.
-8 + 8 + 7x = 13 + 8

Combine like terms: -8 + 8 = 0
0 + 7x = 13 + 8
7x = 13 + 8

Combine like terms: 13 + 8 = 21
7x = 21

Divide each side by '7'.
x = 3

Simplifying
x = 3

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