30+x+20+x-40=180

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Solution for 30+x+20+x-40=180 equation: 



30+x+20+x-40=180

We move all terms to the left:

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

We add all the numbers together, and all the variables

2x-170=0

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

2x=170

x=170/2

x=85

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