b/21=5/7 - solution

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Solution for b/21=5/7 equation:

b in (-oo:+oo)

b/21 = 5/7 // - 5/7

b/21-(5/7) = 0

b/21-5/7 = 0

1/21*b-5/7 = 0 // + 5/7

1/21*b = 5/7 // : 1/21

b = 5/7/1/21

b = 15

b = 15

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