X+7x-100=3x

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Solution for X+7x-100=3x equation: 



X+7X-100=3X

We move all terms to the left:

X+7X-100-(3X)=0

We add all the numbers together, and all the variables

5X-100=0

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

5X=100

X=100/5

X=20

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