-r/7+21=31

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Solution for -r/7+21=31 equation: 


r in (-oo:+oo)

21-r/7 = 31 // - 31

21-r/7-31 = 0

-1/7*r-10 = 0 // + 10

-1/7*r = 10 // : -1/7

r = 10/(-1/7)

r = -70

r = -70

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