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x in (-oo:+oo)
(-1/8)*(x-7)^3-8 = 0
-1/8*(x-7)^3-8 = 0
-1/8*(x-7)^3-8 = 0
21/8*x^2-1/8*x^3-147/8*x+279/8 = 0
21/8*x^2-1/8*x^3-147/8*x+279/8 = 0
1/8*(21*x^2-x^3-147*x+279) = 0
21*x^2-x^3-147*x+279 = 0
{ 1, -1, 3, -3, 9, -9, 31, -31, 93, -93, 279, -279 }
1
x = 1
21*x^2-x^3-147*x+279 = 152
1
-1
x = -1
21*x^2-x^3-147*x+279 = 448
-1
3
x = 3
21*x^2-x^3-147*x+279 = 0
3
x-3
18*x-x^2-93
21*x^2-x^3-147*x+279
x-3
x^3-3*x^2
18*x^2-147*x+279
54*x-18*x^2
279-93*x
93*x-279
0
18*x-x^2-93 = 0
DELTA = 18^2-(-93*(-1)*4)
DELTA = -48
DELTA < 0
x in { 3}
1/8*(x-3) = 0
1/8*(x-3) = 0
( 1/8 )
1/8 = 0
x belongs to the empty set
( x-3 )
x-3 = 0 // + 3
x = 3
x = 3
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