-r/7=4

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Solution for -r/7=4 equation: 


r in (-oo:+oo)

-r/7 = 4 // - 4

-r/7-4 = 0

-1/7*r-4 = 0 // + 4

-1/7*r = 4 // : -1/7

r = 4/(-1/7)

r = -28

r = -28

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