15-r/7=21

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Solution for 15-r/7=21 equation: 


r in (-oo:+oo)

15-(r/7) = 21 // - 21

15-(r/7)-21 = 0

-1/7*r-6 = 0 // + 6

-1/7*r = 6 // : -1/7

r = 6/(-1/7)

r = -42

r = -42

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