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r in (-oo:+oo)
5*r+5/10 = 2*r-(8/2) // - 2*r-(8/2)
5*r-(2*r)+5/10+8/2 = 0
5*r-2*r+5/10+8/2 = 0
3*r+9/2 = 0 // - 9/2
3*r = -9/2 // : 3
r = -9/2/3
r = -3/2
r = -3/2
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