-b-1+6b=-21 - solution

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Solution for -b-1+6b=-21 equation:

b in (-oo:+oo)

6*b-b-1 = -21 // + 21

6*b-b-1+21 = 0

5*b+20 = 0 // - 20

5*b = -20 // : 5

b = -20/5

b = -4

b = -4

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