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7-y-0.2=-3
We move all terms to the left:
7-y-0.2-(-3)=0
We add all the numbers together, and all the variables
-1y+9.8=0
We move all terms containing y to the left, all other terms to the right
-y=-9.8
y=-9.8/-1
y=9+0.8/1
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