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x in (-oo:+oo)
x-((6/7)*x^2) = 0
(-6/7)*x^2+x = 0
x-6/7*x^2 = 0
DELTA = 1^2-(-6/7*0*4)
DELTA = 1
DELTA > 0
x = (1^(1/2)-1)/(-6/7*2) or x = (-1^(1/2)-1)/(-6/7*2)
x = 0 or x = 7/6
x in { 0, 7/6 }
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