-x+1=-3x+21

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Solution for -x+1=-3x+21 equation: 



-x+1=-3x+21

We move all terms to the left:

-x+1-(-3x+21)=0

We add all the numbers together, and all the variables

-1x-(-3x+21)+1=0

We get rid of parentheses

-1x+3x-21+1=0

We add all the numbers together, and all the variables

2x-20=0

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

2x=20

x=20/2

x=10

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