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x in (-oo:+oo)
(x/49)*x^2+(2/14)*x-4-4 = 0
(1/49)*x^3+(1/7)*x-8 = 0
(1/49)*x^3+(1/7)*x-8 = 0 // * 0
{ 1, -1, 2, -2, 4, -4, 7, -7, 8, -8, 14, -14, 28, -28, 49, -49, 56, -56, 98, -98, 196, -196, 392, -392 }
1
x = 1
x^3+7*x-392 = -384
1
-1
x = -1
x^3+7*x-392 = -400
-1
2
x = 2
x^3+7*x-392 = -370
2
-2
x = -2
x^3+7*x-392 = -414
-2
4
x = 4
x^3+7*x-392 = -300
4
-4
x = -4
x^3+7*x-392 = -484
-4
7
x = 7
x^3+7*x-392 = 0
7
x-7
x^2+7*x+56
x^3+7*x-392
x-7
7*x^2-x^3
7*x^2+7*x-392
49*x-7*x^2
56*x-392
392-56*x
0
x^2+7*x+56 = 0
DELTA = 7^2-(1*4*56)
DELTA = -175
DELTA < 0
x in { 7}
x = 7
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