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15=4(q+-1)-(-7)
We move all terms to the left:
15-(4(q+-1)-(-7))=0
We add all the numbers together, and all the variables
-(4(q-1)-(-7))+15=0
We calculate terms in parentheses: -(4(q-1)-(-7)), so:We get rid of parentheses
4(q-1)-(-7)
We add all the numbers together, and all the variables
4(q-1)+7
We multiply parentheses
4q-4+7
We add all the numbers together, and all the variables
4q+3
Back to the equation:
-(4q+3)
-4q-3+15=0
We add all the numbers together, and all the variables
-4q+12=0
We move all terms containing q to the left, all other terms to the right
-4q=-12
q=-12/-4
q=+3
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