3x-21=15

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Solution for 3x-21=15 equation: 


Simplifying
3x + -21 = 15

Reorder the terms:
-21 + 3x = 15

Solving
-21 + 3x = 15

Solving for variable 'x'.

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

Add '21' to each side of the equation.
-21 + 21 + 3x = 15 + 21

Combine like terms: -21 + 21 = 0
0 + 3x = 15 + 21
3x = 15 + 21

Combine like terms: 15 + 21 = 36
3x = 36

Divide each side by '3'.
x = 12

Simplifying
x = 12

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