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3(2+q)+15=0
We simplify the equation to the form, which is simple to understand
3(2+q)+15=0
Reorder the terms in parentheses
+(+6+3q)+15=0
Remove unnecessary parentheses
+6+3q+15=0
We move all terms containing q to the left and all other terms to the right.
+3q=0-6-15
We simplify left and right side of the equation.
+3q=-21
We divide both sides of the equation by 3 to get q.
q=-7
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