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19=4q+7
We move all terms to the left:
19-(4q+7)=0
We get rid of parentheses
-4q-7+19=0
We add all the numbers together, and all the variables
-4q+12=0
We move all terms containing q to the left, all other terms to the right
-4q=-12
q=-12/-4
q=+3
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