(3x)+(7x)+120=180

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Solution for (3x)+(7x)+120=180 equation: 



(3x)+(7x)+120=180

We move all terms to the left:

(3x)+(7x)+120-(180)=0

We add all the numbers together, and all the variables

10x-60=0

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

10x=60

x=60/10

x=6

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