15=r/7

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Solution for 15=r/7 equation: 


r in (-oo:+oo)

15 = r/7 // - r/7

15-(r/7) = 0

15-1/7*r = 0 // - 15

-1/7*r = -15 // : -1/7

r = -15/(-1/7)

r = 105

r = 105

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