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(3*x)/4 = (x^2)/8 // - (x^2)/8
(3*x)/4-((x^2)/8) = 0
3/4*x-1/8*x^2 = 0
DELTA = (3/4)^2-(-1/8*0*4)
DELTA = 9/16
DELTA > 0
x = ((9/16)^(1/2)-3/4)/(-1/8*2) or x = (-(9/16)^(1/2)-3/4)/(-1/8*2)
x = 0 or x = 6
x in { 0, 6 }
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