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(45+y)/15=-3
We move all terms to the left:
(45+y)/15-(-3)=0
We add all the numbers together, and all the variables
(y+45)/15-(-3)=0
We add all the numbers together, and all the variables
(y+45)/15+3=0
We multiply all the terms by the denominator
(y+45)+3*15=0
We add all the numbers together, and all the variables
(y+45)+45=0
We get rid of parentheses
y+45+45=0
We add all the numbers together, and all the variables
y+90=0
We move all terms containing y to the left, all other terms to the right
y=-90
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