7*40+12y=640

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Solution for 7*40+12y=640 equation: 



7*40+12y=640

We move all terms to the left:

7*40+12y-(640)=0

determiningTheFunctionDomain
12y-640+7*40=0

We add all the numbers together, and all the variables

12y-360=0

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

12y=360

y=360/12

y=30

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