4-r/5=-7

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Solution for 4-r/5=-7 equation: 


r in (-oo:+oo)

4-(r/5) = -7 // + 7

4-(r/5)+7 = 0

11-1/5*r = 0 // - 11

-1/5*r = -11 // : -1/5

r = -11/(-1/5)

r = 55

r = 55

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