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12.9y-0.28-13.1y=17.57+1.5y
We move all terms to the left:
12.9y-0.28-13.1y-(17.57+1.5y)=0
We add all the numbers together, and all the variables
12.9y-13.1y-(1.5y+17.57)-0.28=0
We add all the numbers together, and all the variables
-0.2y-(1.5y+17.57)-0.28=0
We get rid of parentheses
-0.2y-1.5y-17.57-0.28=0
We add all the numbers together, and all the variables
-1.7y-17.85=0
We move all terms containing y to the left, all other terms to the right
-1.7y=17.85
y=17.85/-1.7
y=-10+0.85/1.7
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