15=-r/4

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Solution for 15=-r/4 equation: 


r in (-oo:+oo)

15 = -r/4 // + -r/4

15-(-r/4) = 0

(1/4)*r+15 = 0

1/4*r+15 = 0 // - 15

1/4*r = -15 // : 1/4

r = -15/1/4

r = -60

r = -60

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