X-7+8x=21

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Solution for X-7+8x=21 equation: 



X-7+8X=21

We move all terms to the left:

X-7+8X-(21)=0

We add all the numbers together, and all the variables

9X-28=0

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

9X=28

X=28/9

X=3+1/9

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