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8q+12=4(3+21)
We move all terms to the left:
8q+12-(4(3+21))=0
We add all the numbers together, and all the variables
8q+12-(424)=0
We add all the numbers together, and all the variables
8q-412=0
We move all terms containing q to the left, all other terms to the right
8q=412
q=412/8
q=51+1/2
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