42=72-3x

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Solution for 42=72-3x equation: 



42=72-3x

We move all terms to the left:

42-(72-3x)=0

We add all the numbers together, and all the variables

-(-3x+72)+42=0

We get rid of parentheses

3x-72+42=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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