r/4-9=-6

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Solution for r/4-9=-6 equation: 


r in (-oo:+oo)

r/4-9 = -6 // + 6

r/4-9+6 = 0

1/4*r-3 = 0 // + 3

1/4*r = 3 // : 1/4

r = 3/1/4

r = 12

r = 12

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