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

-1/5*r-3 = 0 // + 3

-1/5*r = 3 // : -1/5

r = 3/(-1/5)

r = -15

r = -15

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