7=r/13

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Solution for 7=r/13 equation: 


r in (-oo:+oo)

7 = r/13 // - r/13

7-(r/13) = 0

7-1/13*r = 0 // - 7

-1/13*r = -7 // : -1/13

r = -7/(-1/13)

r = 91

r = 91

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