3x+7x-20=180

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Solution for 3x+7x-20=180 equation: 



3x+7x-20=180

We move all terms to the left:

3x+7x-20-(180)=0

We add all the numbers together, and all the variables

10x-200=0

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

10x=200

x=200/10

x=20

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