(12-y)+4y=30

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Solution for (12-y)+4y=30 equation: 



(12-y)+4y=30

We move all terms to the left:

(12-y)+4y-(30)=0

We add all the numbers together, and all the variables

(-1y+12)+4y-30=0

We add all the numbers together, and all the variables

4y+(-1y+12)-30=0

We get rid of parentheses

4y-1y+12-30=0

We add all the numbers together, and all the variables

3y-18=0

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

3y=18

y=18/3

y=6

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