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15q-3(4q-5)=3q+9-9q
We move all terms to the left:
15q-3(4q-5)-(3q+9-9q)=0
We add all the numbers together, and all the variables
15q-3(4q-5)-(-6q+9)=0
We multiply parentheses
15q-12q-(-6q+9)+15=0
We get rid of parentheses
15q-12q+6q-9+15=0
We add all the numbers together, and all the variables
9q+6=0
We move all terms containing q to the left, all other terms to the right
9q=-6
q=-6/9
q=-2/3
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