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(90-4y)+(130-8y+5y)+(260-8y+3y)=180
We move all terms to the left:
(90-4y)+(130-8y+5y)+(260-8y+3y)-(180)=0
We add all the numbers together, and all the variables
(-4y+90)+(-3y+130)+(-5y+260)-180=0
We get rid of parentheses
-4y-3y-5y+90+130+260-180=0
We add all the numbers together, and all the variables
-12y+300=0
We move all terms containing y to the left, all other terms to the right
-12y=-300
y=-300/-12
y=+25
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