7x+120=400

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Solution for 7x+120=400 equation: 



7x+120=400

We move all terms to the left:

7x+120-(400)=0

We add all the numbers together, and all the variables

7x-280=0

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

7x=280

x=280/7

x=40

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