3x-20+3x+x=120

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Solution for 3x-20+3x+x=120 equation: 



3x-20+3x+x=120

We move all terms to the left:

3x-20+3x+x-(120)=0

We add all the numbers together, and all the variables

7x-140=0

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

7x=140

x=140/7

x=20

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