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140=12+13y
We move all terms to the left:
140-(12+13y)=0
We add all the numbers together, and all the variables
-(13y+12)+140=0
We get rid of parentheses
-13y-12+140=0
We add all the numbers together, and all the variables
-13y+128=0
We move all terms containing y to the left, all other terms to the right
-13y=-128
y=-128/-13
y=9+11/13
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