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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(2/7)*(x+6)+1 = (2*x)/x+6 // - (2*x)/x+6
(2/7)*(x+6)-((2*x)/x)-6+1 = 0
(2/7)*(x+6)-6-2+1 = 0
2/7*(x+6)-6-2+1 = 0
2/7*(x+6)-6-2+1 = 0
2/7*x-30/7-2+1 = 0
2/7*x-44/7+1 = 0
2/7*x-37/7 = 0
2/7*x-37/7 = 0
2/7*x-37/7 = 0 // + 37/7
2/7*x = 37/7 // : 2/7
x = 37/7/2/7
x = 37/2
x = 37/2
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