2x-45+x=180

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Solution for 2x-45+x=180 equation: 



2x-45+x=180

We move all terms to the left:

2x-45+x-(180)=0

We add all the numbers together, and all the variables

3x-225=0

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

3x=225

x=225/3

x=75

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