3x-20+x+40=180

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Solution for 3x-20+x+40=180 equation: 



3x-20+x+40=180

We move all terms to the left:

3x-20+x+40-(180)=0

We add all the numbers together, and all the variables

4x-160=0

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

4x=160

x=160/4

x=40

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