-21=-12x+9+8x+6

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Solution for -21=-12x+9+8x+6 equation:


Simplifying
-21 = -12x + 9 + 8x + 6

Reorder the terms:
-21 = 9 + 6 + -12x + 8x

Combine like terms: 9 + 6 = 15
-21 = 15 + -12x + 8x

Combine like terms: -12x + 8x = -4x
-21 = 15 + -4x

Solving
-21 = 15 + -4x

Solving for variable 'x'.

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

Add '4x' to each side of the equation.
-21 + 4x = 15 + -4x + 4x

Combine like terms: -4x + 4x = 0
-21 + 4x = 15 + 0
-21 + 4x = 15

Add '21' to each side of the equation.
-21 + 21 + 4x = 15 + 21

Combine like terms: -21 + 21 = 0
0 + 4x = 15 + 21
4x = 15 + 21

Combine like terms: 15 + 21 = 36
4x = 36

Divide each side by '4'.
x = 9

Simplifying
x = 9

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