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3y+40+3(-3y+70)=180
We move all terms to the left:
3y+40+3(-3y+70)-(180)=0
We add all the numbers together, and all the variables
3y+3(-3y+70)-140=0
We multiply parentheses
3y-9y+210-140=0
We add all the numbers together, and all the variables
-6y+70=0
We move all terms containing y to the left, all other terms to the right
-6y=-70
y=-70/-6
y=11+2/3
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