3x+20+x+20=180

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Solution for 3x+20+x+20=180 equation: 



3x+20+x+20=180

We move all terms to the left:

3x+20+x+20-(180)=0

We add all the numbers together, and all the variables

4x-140=0

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

4x=140

x=140/4

x=35

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