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r in (-oo:+oo)
4*(2*r-8) = (1/2)*(49*r+70) // - (1/2)*(49*r+70)
4*(2*r-8)-((1/2)*(49*r+70)) = 0
4*(2*r-8)+(-1/2)*(49*r+70) = 0
4*(2*r-8)-1/2*(49*r+70) = 0
4*(2*r-8)-1/2*(49*r+70) = 0
-33/2*r-67 = 0
-33/2*r-67 = 0
-33/2*r-67 = 0 // + 67
-33/2*r = 67 // : -33/2
r = 67/(-33/2)
r = -134/33
r = -134/33
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