12+8y+7-7y=31

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Solution for 12+8y+7-7y=31 equation: 



12+8y+7-7y=31

We move all terms to the left:

12+8y+7-7y-(31)=0

We add all the numbers together, and all the variables

y-12=0

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

y=12

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