-4b-9=-21-7b - solution

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Solution for -4b-9=-21-7b equation:

b in (-oo:+oo)

-4*b-9 = -(7*b)-21 // + -(7*b)-21

7*b-4*b-9+21 = 0

3*b+12 = 0 // - 12

3*b = -12 // : 3

b = -12/3

b = -4

b = -4

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