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-9.9y=-9.9
We move all terms to the left:
-9.9y-(-9.9)=0
We add all the numbers together, and all the variables
-9.9y+9.9=0
We move all terms containing y to the left, all other terms to the right
-9.9y=-9.9
y=-9.9/-9.9
y=1
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