3q-18=21

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Solution for 3q-18=21 equation: 


Simplifying
3q + -18 = 21

Reorder the terms:
-18 + 3q = 21

Solving
-18 + 3q = 21

Solving for variable 'q'.

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

Add '18' to each side of the equation.
-18 + 18 + 3q = 21 + 18

Combine like terms: -18 + 18 = 0
0 + 3q = 21 + 18
3q = 21 + 18

Combine like terms: 21 + 18 = 39
3q = 39

Divide each side by '3'.
q = 13

Simplifying
q = 13

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