70+x+x-20=180

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Solution for 70+x+x-20=180 equation: 



70+x+x-20=180

We move all terms to the left:

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

We add all the numbers together, and all the variables

2x-130=0

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

2x=130

x=130/2

x=65

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