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r in (-oo:+oo)
15*r+20/10 = 3*r-(6/3) // - 3*r-(6/3)
15*r-(3*r)+20/10+6/3 = 0
15*r-3*r+20/10+6/3 = 0
12*r+4 = 0 // - 4
12*r = -4 // : 12
r = -4/12
r = -1/3
r = -1/3
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