3x-20+90+2x+45=180

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Solution for 3x-20+90+2x+45=180 equation: 



3x-20+90+2x+45=180

We move all terms to the left:

3x-20+90+2x+45-(180)=0

We add all the numbers together, and all the variables

5x-65=0

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

5x=65

x=65/5

x=13

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