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5(70-y)+9y=550
We move all terms to the left:
5(70-y)+9y-(550)=0
We add all the numbers together, and all the variables
5(-1y+70)+9y-550=0
We add all the numbers together, and all the variables
9y+5(-1y+70)-550=0
We multiply parentheses
9y-5y+350-550=0
We add all the numbers together, and all the variables
4y-200=0
We move all terms containing y to the left, all other terms to the right
4y=200
y=200/4
y=50
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