3x+6x-9=5x-2x-21

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Solution for 3x+6x-9=5x-2x-21 equation:


Simplifying
3x + 6x + -9 = 5x + -2x + -21

Reorder the terms:
-9 + 3x + 6x = 5x + -2x + -21

Combine like terms: 3x + 6x = 9x
-9 + 9x = 5x + -2x + -21

Reorder the terms:
-9 + 9x = -21 + 5x + -2x

Combine like terms: 5x + -2x = 3x
-9 + 9x = -21 + 3x

Solving
-9 + 9x = -21 + 3x

Solving for variable 'x'.

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

Add '-3x' to each side of the equation.
-9 + 9x + -3x = -21 + 3x + -3x

Combine like terms: 9x + -3x = 6x
-9 + 6x = -21 + 3x + -3x

Combine like terms: 3x + -3x = 0
-9 + 6x = -21 + 0
-9 + 6x = -21

Add '9' to each side of the equation.
-9 + 9 + 6x = -21 + 9

Combine like terms: -9 + 9 = 0
0 + 6x = -21 + 9
6x = -21 + 9

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

Divide each side by '6'.
x = -2

Simplifying
x = -2

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