3x+42=4x-12

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Solution for 3x+42=4x-12 equation: 



3x+42=4x-12

We move all terms to the left:

3x+42-(4x-12)=0

We get rid of parentheses

3x-4x+12+42=0

We add all the numbers together, and all the variables

-1x+54=0

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

-x=-54

x=-54/-1

x=+54

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