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D( x )
8*x+7 = 0
8*x+7 = 0
8*x+7 = 0
8*x+7 = 0 // - 7
8*x = -7 // : 8
x = -7/8
x in (-oo:-7/8) U (-7/8:+oo)
((x+4)*(x+6))/(8*x+7) = 0
( x+4 )
x+4 = 0 // - 4
x = -4
( x+6 )
x+6 = 0 // - 6
x = -6
x in { -4, -6 }
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