X+1-4x+8=21

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Solution for X+1-4x+8=21 equation: 



X+1-4X+8=21

We move all terms to the left:

X+1-4X+8-(21)=0

We add all the numbers together, and all the variables

-3X-12=0

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

-3X=12

X=12/-3

X=-4

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