b/21=-4 - solution

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Solution for b/21=-4 equation:

b in (-oo:+oo)

b/21 = -4 // + 4

b/21+4 = 0

1/21*b+4 = 0 // - 4

1/21*b = -4 // : 1/21

b = -4/1/21

b = -84

b = -84

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