-7x-21=15-10x

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Solution for -7x-21=15-10x equation:


Simplifying
-7x + -21 = 15 + -10x

Reorder the terms:
-21 + -7x = 15 + -10x

Solving
-21 + -7x = 15 + -10x

Solving for variable 'x'.

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

Add '10x' to each side of the equation.
-21 + -7x + 10x = 15 + -10x + 10x

Combine like terms: -7x + 10x = 3x
-21 + 3x = 15 + -10x + 10x

Combine like terms: -10x + 10x = 0
-21 + 3x = 15 + 0
-21 + 3x = 15

Add '21' to each side of the equation.
-21 + 21 + 3x = 15 + 21

Combine like terms: -21 + 21 = 0
0 + 3x = 15 + 21
3x = 15 + 21

Combine like terms: 15 + 21 = 36
3x = 36

Divide each side by '3'.
x = 12

Simplifying
x = 12

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