-x+1=21-3x

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


x in (-oo:+oo)

1-x = 21-(3*x) // - 21-(3*x)

3*x-x-21+1 = 0

2*x-20 = 0 // + 20

2*x = 20 // : 2

x = 20/2

x = 10

x = 10

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