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(1/7)*x^2-(5*x) = 0
(1/7)*x^2-5*x = 0
1/7*x^2-5*x = 0
DELTA = (-5)^2-(0*1/7*4)
DELTA = 25
DELTA > 0
x = (25^(1/2)+5)/(1/7*2) or x = (5-25^(1/2))/(1/7*2)
x = 35 or x = 0
x in { 0, 35 }
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