3x+42=120

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Solution for 3x+42=120 equation: 



3x+42=120

We move all terms to the left:

3x+42-(120)=0

We add all the numbers together, and all the variables

3x-78=0

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

3x=78

x=78/3

x=26

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