r/8-21=-12

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Solution for r/8-21=-12 equation: 


r in (-oo:+oo)

r/8-21 = -12 // + 12

r/8-21+12 = 0

1/8*r-9 = 0 // + 9

1/8*r = 9 // : 1/8

r = 9/1/8

r = 72

r = 72

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