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30q+240=50q-160
We move all terms to the left:
30q+240-(50q-160)=0
We get rid of parentheses
30q-50q+160+240=0
We add all the numbers together, and all the variables
-20q+400=0
We move all terms containing q to the left, all other terms to the right
-20q=-400
q=-400/-20
q=+20
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