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(1/2)*x*(x-12)-110 = 0
1/2*x*(x-12)-110 = 0
1/2*x*(x-12)-110 = 0
1/2*x^2-6*x-110 = 0
1/2*x^2-6*x-110 = 0
1/2*x^2-6*x-110 = 0
DELTA = (-6)^2-(-110*1/2*4)
DELTA = 256
DELTA > 0
x = (256^(1/2)+6)/(1/2*2) or x = (6-256^(1/2))/(1/2*2)
x = 22 or x = -10
(x+10)*(x-22) = 0
(x+10)*(x-22) = 0
( x+10 )
x+10 = 0 // - 10
x = -10
( x-22 )
x-22 = 0 // + 22
x = 22
x in { -10, 22 }
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