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40-5y=-y+4
We move all terms to the left:
40-5y-(-y+4)=0
We add all the numbers together, and all the variables
-5y-(-1y+4)+40=0
We get rid of parentheses
-5y+1y-4+40=0
We add all the numbers together, and all the variables
-4y+36=0
We move all terms containing y to the left, all other terms to the right
-4y=-36
y=-36/-4
y=+9
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