81=45+r/5

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Solution for 81=45+r/5 equation: 


r in (-oo:+oo)

81 = r/5+45 // - r/5+45

81-(r/5)-45 = 0

36-1/5*r = 0 // - 36

-1/5*r = -36 // : -1/5

r = -36/(-1/5)

r = 180

r = 180

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