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-0.9y=2.5
We move all terms to the left:
-0.9y-(2.5)=0
We add all the numbers together, and all the variables
-0.9y-2.5=0
We move all terms containing y to the left, all other terms to the right
-0.9y=2.5
y=2.5/-0.9
y=-2+0.7/0.9
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