3(7-y)+5(y-4)=9

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Solution for 3(7-y)+5(y-4)=9 equation: 



3(7-y)+5(y-4)=9

We move all terms to the left:

3(7-y)+5(y-4)-(9)=0

We add all the numbers together, and all the variables

3(-1y+7)+5(y-4)-9=0

We multiply parentheses

-3y+5y+21-20-9=0

We add all the numbers together, and all the variables

2y-8=0

We move all terms containing y to the left, all other terms to the right

2y=8

y=8/2

y=4

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