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6*((24*x)/2)*x+7*x+3*x-42 = 0
72*x^2+10*x-42 = 0
DELTA = 10^2-(-42*4*72)
DELTA = 12196
DELTA > 0
x = (12196^(1/2)-10)/(2*72) or x = (-12196^(1/2)-10)/(2*72)
x = (2*3049^(1/2)-10)/144 or x = (-2*3049^(1/2)-10)/144
x in { (-2*3049^(1/2)-10)/144, (2*3049^(1/2)-10)/144 }
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