120x-400=40x

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Solution for 120x-400=40x equation: 



120x-400=40x

We move all terms to the left:

120x-400-(40x)=0

We add all the numbers together, and all the variables

80x-400=0

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

80x=400

x=400/80

x=5

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