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((7*x)/5)*x = 10*x-((4/6)*x) // - 10*x-((4/6)*x)
((7*x)/5)*x-(10*x)+(4/6)*x = 0
((7*x)/5)*x-10*x+(4/6)*x = 0
7/5*x^2-28/3*x = 0
DELTA = (-28/3)^2-(0*7/5*4)
DELTA = 784/9
DELTA > 0
x = ((784/9)^(1/2)+28/3)/(7/5*2) or x = (28/3-(784/9)^(1/2))/(7/5*2)
x = 20/3 or x = 0
x in { 0, 20/3 }
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