400-4x=120

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Solution for 400-4x=120 equation: 



400-4x=120

We move all terms to the left:

400-4x-(120)=0

We add all the numbers together, and all the variables

-4x+280=0

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

-4x=-280

x=-280/-4

x=+70

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