2x+x-120=90

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Solution for 2x+x-120=90 equation: 



2x+x-120=90

We move all terms to the left:

2x+x-120-(90)=0

We add all the numbers together, and all the variables

3x-210=0

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

3x=210

x=210/3

x=70

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