b/9+1/7=13 - solution

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Solution for b/9+1/7=13 equation:

b in (-oo:+oo)

b/9+1/7 = 13 // - 13

b/9+1/7-13 = 0

1/9*b-90/7 = 0 // + 90/7

1/9*b = 90/7 // : 1/9

b = 90/7/1/9

b = 810/7

b = 810/7

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