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r in (-oo:+oo)
0.6*(205-r-(18/2))+r = 144 // - 144
0.6*(205-r-(18/2))+r-144 = 0
0.6*(205-r-9)+r-144 = 0
0.6*(196-r)+r-144 = 0
0.6*(196-r)+r-144 = 0
0.4*r-144+117.6 = 0
0.4*r-26.4 = 0
0.4*r-26.4 = 0
0.4*r-26.4 = 0 // + 26.4
0.4*r = 26.4 // : 0.4
r = 26.4/0.4
r = 66
r = 66
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