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8.7-5q=6.2
We move all terms to the left:
8.7-5q-(6.2)=0
We add all the numbers together, and all the variables
-5q+2.5=0
We move all terms containing q to the left, all other terms to the right
-5q=-2.5
q=-2.5/-5
q=2.5/5
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