3x+12-15=21

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Solution for 3x+12-15=21 equation: 


Simplifying
3x + 12 + -15 = 21

Reorder the terms:
12 + -15 + 3x = 21

Combine like terms: 12 + -15 = -3
-3 + 3x = 21

Solving
-3 + 3x = 21

Solving for variable 'x'.

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

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

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

Combine like terms: 21 + 3 = 24
3x = 24

Divide each side by '3'.
x = 8

Simplifying
x = 8

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