y+4y=8+7

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Solution for y+4y=8+7 equation: 



y+4y=8+7

We move all terms to the left:

y+4y-(8+7)=0

We add all the numbers together, and all the variables

y+4y-15=0

We add all the numbers together, and all the variables

5y-15=0

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

5y=15

y=15/5

y=3

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