42+x=12+3x

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Solution for 42+x=12+3x equation: 



42+x=12+3x

We move all terms to the left:

42+x-(12+3x)=0

We add all the numbers together, and all the variables

x-(3x+12)+42=0

We get rid of parentheses

x-3x-12+42=0

We add all the numbers together, and all the variables

-2x+30=0

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

-2x=-30

x=-30/-2

x=+15

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