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70=40+2y
We move all terms to the left:
70-(40+2y)=0
We add all the numbers together, and all the variables
-(2y+40)+70=0
We get rid of parentheses
-2y-40+70=0
We add all the numbers together, and all the variables
-2y+30=0
We move all terms containing y to the left, all other terms to the right
-2y=-30
y=-30/-2
y=+15
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