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(1/2)*x^2-(37*x) = -504 // + 504
(1/2)*x^2-(37*x)+504 = 0
(1/2)*x^2-37*x+504 = 0
1/2*x^2-37*x+504 = 0
DELTA = (-37)^2-(1/2*4*504)
DELTA = 361
DELTA > 0
x = (361^(1/2)+37)/(1/2*2) or x = (37-361^(1/2))/(1/2*2)
x = 56 or x = 18
x in { 18, 56 }
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