-1+3b=20

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Solution for -1+3b=20 equation: 


b in (-oo:+oo)

3*b-1 = 20 // - 20

3*b-20-1 = 0

3*b-21 = 0 // + 21

3*b = 21 // : 3

b = 21/3

b = 7

b = 7

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