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r in (-oo:+oo)
(-4/5)*r+4*r = (1/4)*r+59/4 // - (1/4)*r+59/4
(-4/5)*r+4*r-((1/4)*r)-(59/4) = 0
(-4/5)*r+4*r+(-1/4)*r-59/4 = 0
59/20*r-59/4 = 0 // + 59/4
59/20*r = 59/4 // : 59/20
r = 59/4/59/20
r = 5
r = 5
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