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r in (-oo:+oo)
r-((6/4)*r)+(3/5)*r = 2/5 // - 2/5
r-((6/4)*r)+(3/5)*r-(2/5) = 0
r+(-3/2)*r+(3/5)*r-2/5 = 0
1/10*r-2/5 = 0 // + 2/5
1/10*r = 2/5 // : 1/10
r = 2/5/1/10
r = 4
r = 4
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