6x-9+3x=-21

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


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

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

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

Solving
-9 + 9x = -21

Solving for variable 'x'.

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

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

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

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

Divide each side by '9'.
x = -1.333333333

Simplifying
x = -1.333333333

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