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-3.5y-6.2y=-87.3
We move all terms to the left:
-3.5y-6.2y-(-87.3)=0
We add all the numbers together, and all the variables
-9.7y+87.3=0
We move all terms containing y to the left, all other terms to the right
-9.7y=-87.3
y=-87.3/-9.7
y=+9
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