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9=0.1y+8.7
We move all terms to the left:
9-(0.1y+8.7)=0
We get rid of parentheses
-0.1y-8.7+9=0
We add all the numbers together, and all the variables
-0.1y+0.3=0
We move all terms containing y to the left, all other terms to the right
-0.1y=-0.3
y=-0.3/-0.1
y=2+0.1/0.1
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