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120-84=40y-49y
We move all terms to the left:
120-84-(40y-49y)=0
We add all the numbers together, and all the variables
-(-9y)+120-84=0
We add all the numbers together, and all the variables
-(-9y)+36=0
We get rid of parentheses
9y+36=0
We move all terms containing y to the left, all other terms to the right
9y=-36
y=-36/9
y=-4
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