X.4x-7=21

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Solution for X.4x-7=21 equation: 



X.4X-7=21

We move all terms to the left:

X.4X-7-(21)=0

We add all the numbers together, and all the variables

X.4X-28=0

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

X.4X=28

X=28/1

X=28

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