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x in (-oo:+oo)
(2*x^2-(17*x))/2 = 42 // - 42
(2*x^2-(17*x))/2-42 = 0
(2*x^2-17*x)/2-42 = 0
(2*x^2-17*x)/2+(-42*2)/2 = 0
2*x^2-17*x-42*2 = 0
2*x^2-17*x-84 = 0
2*x^2-17*x-84 = 0
2*x^2-17*x-84 = 0
DELTA = (-17)^2-(-84*2*4)
DELTA = 961
DELTA > 0
x = (961^(1/2)+17)/(2*2) or x = (17-961^(1/2))/(2*2)
x = 12 or x = -7/2
(x+7/2)*(x-12) = 0
((x+7/2)*(x-12))/2 = 0
((x+7/2)*(x-12))/2 = 0 // * 2
(x+7/2)*(x-12) = 0
( x+7/2 )
x+7/2 = 0 // - 7/2
x = -7/2
( x-12 )
x-12 = 0 // + 12
x = 12
x in { -7/2, 12 }
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