X+2y+42=12

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Solution for X+2y+42=12 equation: 



X+2X+42=12

We move all terms to the left:

X+2X+42-(12)=0

We add all the numbers together, and all the variables

3X+30=0

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

3X=-30

X=-30/3

X=-10

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