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(3y-10)+(y+40)+90=180
We move all terms to the left:
(3y-10)+(y+40)+90-(180)=0
We add all the numbers together, and all the variables
(3y-10)+(y+40)-90=0
We get rid of parentheses
3y+y-10+40-90=0
We add all the numbers together, and all the variables
4y-60=0
We move all terms containing y to the left, all other terms to the right
4y=60
y=60/4
y=15
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