400-4x=100

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Solution for 400-4x=100 equation: 



400-4x=100

We move all terms to the left:

400-4x-(100)=0

We add all the numbers together, and all the variables

-4x+300=0

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

-4x=-300

x=-300/-4

x=+75

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