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r in (-oo:+oo)
5*(7*r-3)-((3/4)*(12*r-8)) = 4 // - 4
5*(7*r-3)-((3/4)*(12*r-8))-4 = 0
5*(7*r-3)+(-3/4)*(12*r-8)-4 = 0
5*(7*r-3)-3/4*(12*r-8)-4 = 0
5*(7*r-3)-3/4*(12*r-8)-4 = 0
26*r-9-4 = 0
26*r-13 = 0
26*r-13 = 0
26*r-13 = 0 // + 13
26*r = 13 // : 26
r = 13/26
r = 1/2
r = 1/2
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