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40=14y-30
We move all terms to the left:
40-(14y-30)=0
We get rid of parentheses
-14y+30+40=0
We add all the numbers together, and all the variables
-14y+70=0
We move all terms containing y to the left, all other terms to the right
-14y=-70
y=-70/-14
y=+5
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