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3*(8*x+6)+((7*x)/4)*x = 0
3*(8*x+6)+(7*x^2)/4 = 0
(3*4*(8*x+6))/4+(7*x^2)/4 = 0
3*4*(8*x+6)+7*x^2 = 0
7*x^2+96*x+72 = 0
7*x^2+96*x+72 = 0
7*x^2+96*x+72 = 0
DELTA = 96^2-(4*7*72)
DELTA = 7200
DELTA > 0
x = (7200^(1/2)-96)/(2*7) or x = (-7200^(1/2)-96)/(2*7)
x = (60*2^(1/2)-96)/14 or x = (-60*2^(1/2)-96)/14
(x-((-60*2^(1/2)-96)/14))*(x-((60*2^(1/2)-96)/14)) = 0
((x-((-60*2^(1/2)-96)/14))*(x-((60*2^(1/2)-96)/14)))/4 = 0
((x-((-60*2^(1/2)-96)/14))*(x-((60*2^(1/2)-96)/14)))/4 = 0 // * 4
(x-((-60*2^(1/2)-96)/14))*(x-((60*2^(1/2)-96)/14)) = 0
( x-((-60*2^(1/2)-96)/14) )
x-((-60*2^(1/2)-96)/14) = 0 // + (-60*2^(1/2)-96)/14
x = (-60*2^(1/2)-96)/14
( x-((60*2^(1/2)-96)/14) )
x-((60*2^(1/2)-96)/14) = 0 // + (60*2^(1/2)-96)/14
x = (60*2^(1/2)-96)/14
x in { (-60*2^(1/2)-96)/14, (60*2^(1/2)-96)/14 }
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