3x-6+12=21

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Solution for 3x-6+12=21 equation: 


Simplifying
3x + -6 + 12 = 21

Reorder the terms:
-6 + 12 + 3x = 21

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

Solving
6 + 3x = 21

Solving for variable 'x'.

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

Add '-6' to each side of the equation.
6 + -6 + 3x = 21 + -6

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

Combine like terms: 21 + -6 = 15
3x = 15

Divide each side by '3'.
x = 5

Simplifying
x = 5

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