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x in (-oo:+oo)
(1/3)*(x+4)^2-15 = -3 // + 3
(1/3)*(x+4)^2-15+3 = 0
1/3*(x+4)^2-15+3 = 0
1/3*(x+4)^2-15+3 = 0
1/3*x^2+8/3*x-29/3+3 = 0
1/3*x^2+8/3*x-20/3 = 0
1/3*x^2+8/3*x-20/3 = 0
1/3*(x^2+8*x-20) = 0
x^2+8*x-20 = 0
DELTA = 8^2-(-20*1*4)
DELTA = 144
DELTA > 0
x = (144^(1/2)-8)/(1*2) or x = (-144^(1/2)-8)/(1*2)
x = 2 or x = -10
1/3*(x+10)*(x-2) = 0
1/3*(x+10)*(x-2) = 0
( x+10 )
x+10 = 0 // - 10
x = -10
( x-2 )
x-2 = 0 // + 2
x = 2
x in { -10, 2 }
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