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i in (-oo:+oo)
10*i-(((2*i)/3)*i) = 0
(-2/3)*i^2+10*i = 0
10*i-2/3*i^2 = 0
DELTA = 10^2-(-2/3*0*4)
DELTA = 100
DELTA > 0
i = (100^(1/2)-10)/(-2/3*2) or i = (-100^(1/2)-10)/(-2/3*2)
i = 0 or i = 15
i in { 0, 15 }
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