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D( x )
x+8 = 0
x+8 = 0
x+8 = 0
x+8 = 0 // - 8
x = -8
x in (-oo:-8) U (-8:+oo)
(3*X^4-X^3+2*x+0^2+7)/(x+8) = 0
(3*X^4-X^3+2*x+7)/(x+8) = 0
3*X^4-X^3+2*x+7 = 0 // - 3*X^4-X^3+7
2*x = -(3*X^4-X^3+7) // : 2
x = (-(3*X^4-X^3+7))/2
x = (-(3*X^4-X^3+7))/2
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