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19.5=q+15.8
We move all terms to the left:
19.5-(q+15.8)=0
We get rid of parentheses
-q-15.8+19.5=0
We add all the numbers together, and all the variables
-1q+3.7=0
We move all terms containing q to the left, all other terms to the right
-q=-3.7
q=-3.7/-1
q=3+0.7/1
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