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771+(627+q)=(771+627)+521
We move all terms to the left:
771+(627+q)-((771+627)+521)=0
We add all the numbers together, and all the variables
(q+627)+771-(1398+521)=0
We add all the numbers together, and all the variables
(q+627)-1148=0
We get rid of parentheses
q+627-1148=0
We add all the numbers together, and all the variables
q-521=0
We move all terms containing q to the left, all other terms to the right
q=521
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