3/15=b/45

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Solution for 3/15=b/45 equation: 


b in (-oo:+oo)

3/15 = b/45 // - b/45

3/15-(b/45) = 0

1/5-1/45*b = 0 // - 1/5

-1/45*b = -1/5 // : -1/45

b = -1/5/(-1/45)

b = 9

b = 9

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