-21=-9x+15

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


Simplifying
-21 = -9x + 15

Reorder the terms:
-21 = 15 + -9x

Solving
-21 = 15 + -9x

Solving for variable 'x'.

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

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

Combine like terms: -9x + 9x = 0
-21 + 9x = 15 + 0
-21 + 9x = 15

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

Combine like terms: -21 + 21 = 0
0 + 9x = 15 + 21
9x = 15 + 21

Combine like terms: 15 + 21 = 36
9x = 36

Divide each side by '9'.
x = 4

Simplifying
x = 4

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