y+3y=7y+12

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Solution for y+3y=7y+12 equation: 



y+3y=7y+12

We move all terms to the left:

y+3y-(7y+12)=0

We add all the numbers together, and all the variables

4y-(7y+12)=0

We get rid of parentheses

4y-7y-12=0

We add all the numbers together, and all the variables

-3y-12=0

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

-3y=12

y=12/-3

y=-4

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