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7q+990=5q+10^3
We move all terms to the left:
7q+990-(5q+10^3)=0
We get rid of parentheses
7q-5q+990-10^3=0
We add all the numbers together, and all the variables
2q-10=0
We move all terms containing q to the left, all other terms to the right
2q=10
q=10/2
q=5
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