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140-y-(2y-50)=180
We move all terms to the left:
140-y-(2y-50)-(180)=0
We add all the numbers together, and all the variables
-1y-(2y-50)-40=0
We get rid of parentheses
-1y-2y+50-40=0
We add all the numbers together, and all the variables
-3y+10=0
We move all terms containing y to the left, all other terms to the right
-3y=-10
y=-10/-3
y=3+1/3
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