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(20+y)+(15-4y)=180
We move all terms to the left:
(20+y)+(15-4y)-(180)=0
We add all the numbers together, and all the variables
(y+20)+(-4y+15)-180=0
We get rid of parentheses
y-4y+20+15-180=0
We add all the numbers together, and all the variables
-3y-145=0
We move all terms containing y to the left, all other terms to the right
-3y=145
y=145/-3
y=-48+1/3
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