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75q=50q-100
We move all terms to the left:
75q-(50q-100)=0
We get rid of parentheses
75q-50q+100=0
We add all the numbers together, and all the variables
25q+100=0
We move all terms containing q to the left, all other terms to the right
25q=-100
q=-100/25
q=-4
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