b/18=21 - solution

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Solution for b/18=21 equation:

b in (-oo:+oo)

b/18 = 21 // - 21

b/18-21 = 0

1/18*b-21 = 0 // + 21

1/18*b = 21 // : 1/18

b = 21/1/18

b = 378

b = 378

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