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r in (-oo:+oo)
2*(4*r+6) = (-2/3)*(12*r+18) // - (-2/3)*(12*r+18)
2*(4*r+6)-((-2/3)*(12*r+18)) = 0
2*(4*r+6)+(2/3)*(12*r+18) = 0
2*(4*r+6)+2/3*(12*r+18) = 0
2*(4*r+6)+2/3*(12*r+18) = 0
16*r+24 = 0
16*r+24 = 0
16*r+24 = 0 // - 24
16*r = -24 // : 16
r = -24/16
r = -3/2
r = -3/2
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