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(5-2y)+(5-2y)=90
We move all terms to the left:
(5-2y)+(5-2y)-(90)=0
We add all the numbers together, and all the variables
(-2y+5)+(-2y+5)-90=0
We get rid of parentheses
-2y-2y+5+5-90=0
We add all the numbers together, and all the variables
-4y-80=0
We move all terms containing y to the left, all other terms to the right
-4y=80
y=80/-4
y=-20
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