3x+x-120=90-2x

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Solution for 3x+x-120=90-2x equation: 



3x+x-120=90-2x

We move all terms to the left:

3x+x-120-(90-2x)=0

We add all the numbers together, and all the variables

3x+x-(-2x+90)-120=0

We add all the numbers together, and all the variables

4x-(-2x+90)-120=0

We get rid of parentheses

4x+2x-90-120=0

We add all the numbers together, and all the variables

6x-210=0

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

6x=210

x=210/6

x=35

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