15-9x=21-7x

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Solution for 15-9x=21-7x equation:


Simplifying
15 + -9x = 21 + -7x

Solving
15 + -9x = 21 + -7x

Solving for variable 'x'.

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

Add '7x' to each side of the equation.
15 + -9x + 7x = 21 + -7x + 7x

Combine like terms: -9x + 7x = -2x
15 + -2x = 21 + -7x + 7x

Combine like terms: -7x + 7x = 0
15 + -2x = 21 + 0
15 + -2x = 21

Add '-15' to each side of the equation.
15 + -15 + -2x = 21 + -15

Combine like terms: 15 + -15 = 0
0 + -2x = 21 + -15
-2x = 21 + -15

Combine like terms: 21 + -15 = 6
-2x = 6

Divide each side by '-2'.
x = -3

Simplifying
x = -3

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