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16=2q-4
We move all terms to the left:
16-(2q-4)=0
We get rid of parentheses
-2q+4+16=0
We add all the numbers together, and all the variables
-2q+20=0
We move all terms containing q to the left, all other terms to the right
-2q=-20
q=-20/-2
q=+10
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