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-8.5=y/4-2.1
We move all terms to the left:
-8.5-(y/4-2.1)=0
We get rid of parentheses
-y/4+2.1-8.5=0
We multiply all the terms by the denominator
-y+(2.1)*4-(8.5)*4=0
We add all the numbers together, and all the variables
-1y-25.6=0
We move all terms containing y to the left, all other terms to the right
-y=25.6
y=25.6/-1
y=-25+0.6/1
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