2x+x-90=180

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Solution for 2x+x-90=180 equation: 



2x+x-90=180

We move all terms to the left:

2x+x-90-(180)=0

We add all the numbers together, and all the variables

3x-270=0

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

3x=270

x=270/3

x=90

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