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(2y+20)+(210-4y)=180
We move all terms to the left:
(2y+20)+(210-4y)-(180)=0
We add all the numbers together, and all the variables
(2y+20)+(-4y+210)-180=0
We get rid of parentheses
2y-4y+20+210-180=0
We add all the numbers together, and all the variables
-2y+50=0
We move all terms containing y to the left, all other terms to the right
-2y=-50
y=-50/-2
y=+25
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