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r in (-oo:+oo)
4*r-((8/5)*r) = (1/4)*r+43/4 // - (1/4)*r+43/4
4*r-((8/5)*r)-((1/4)*r)-(43/4) = 0
(-8/5)*r+4*r+(-1/4)*r-43/4 = 0
43/20*r-43/4 = 0 // + 43/4
43/20*r = 43/4 // : 43/20
r = 43/4/43/20
r = 5
r = 5
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