1x+1-4x+8=21

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



1x+1-4x+8=21

We move all terms to the left:

1x+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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