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x^2-(7*x^2)-((36/42)*x) = 0
x^2-7*x^2+(-6/7)*x = 0
-6*x^2-6/7*x = 0
DELTA = (-6/7)^2-(-6*0*4)
DELTA = 36/49
DELTA > 0
x = ((36/49)^(1/2)+6/7)/(-6*2) or x = (6/7-(36/49)^(1/2))/(-6*2)
x = -1/7 or x = 0
x in { -1/7, 0 }
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