6x-9-3x+21=0

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Solution for 6x-9-3x+21=0 equation:


Simplifying
6x + -9 + -3x + 21 = 0

Reorder the terms:
-9 + 21 + 6x + -3x = 0

Combine like terms: -9 + 21 = 12
12 + 6x + -3x = 0

Combine like terms: 6x + -3x = 3x
12 + 3x = 0

Solving
12 + 3x = 0

Solving for variable 'x'.

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

Add '-12' to each side of the equation.
12 + -12 + 3x = 0 + -12

Combine like terms: 12 + -12 = 0
0 + 3x = 0 + -12
3x = 0 + -12

Combine like terms: 0 + -12 = -12
3x = -12

Divide each side by '3'.
x = -4

Simplifying
x = -4

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