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4q-8=q+4.q
We move all terms to the left:
4q-8-(q+4.q)=0
We add all the numbers together, and all the variables
4q-(+5q)-8=0
We get rid of parentheses
4q-5q-8=0
We add all the numbers together, and all the variables
-1q-8=0
We move all terms containing q to the left, all other terms to the right
-q=8
q=8/-1
q=-8
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