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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(8.75-x)/x = -3 // + 3
(8.75-x)/x+3 = 0
(8.75-x)/x+(3*x)/x = 0
3*x-x+8.75 = 0
2*x+8.75 = 0
(2*x+8.75)/x = 0
(2*x+8.75)/x = 0 // * x
2*x+8.75 = 0
2*x+8.75 = 0 // - 8.75
2*x = -8.75 // : 2
x = -8.75/2
x = -4.375
x = -4.375
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