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r in (-oo:+oo)
3*r-((6/5)*r)+10 = 0
3*r+(-6/5)*r+10 = 0
9/5*r+10 = 0 // - 10
9/5*r = -10 // : 9/5
r = -10/9/5
r = -50/9
r = -50/9
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