6x+3x-12=15

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Solution for 6x+3x-12=15 equation:


Simplifying
6x + 3x + -12 = 15

Reorder the terms:
-12 + 6x + 3x = 15

Combine like terms: 6x + 3x = 9x
-12 + 9x = 15

Solving
-12 + 9x = 15

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 + 9x = 15 + 12

Combine like terms: -12 + 12 = 0
0 + 9x = 15 + 12
9x = 15 + 12

Combine like terms: 15 + 12 = 27
9x = 27

Divide each side by '9'.
x = 3

Simplifying
x = 3

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