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12.6=3.7+1.78y
We move all terms to the left:
12.6-(3.7+1.78y)=0
We add all the numbers together, and all the variables
-(1.78y+3.7)+12.6=0
We get rid of parentheses
-1.78y-3.7+12.6=0
We add all the numbers together, and all the variables
-1.78y+8.9=0
We move all terms containing y to the left, all other terms to the right
-1.78y=-8.9
y=-8.9/-1.78
y=+5
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