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D( x )
7*x-8 = 0
7*x-8 = 0
7*x-8 = 0
7*x-8 = 0 // + 8
7*x = 8 // : 7
x = 8/7
x in (-oo:8/7) U (8/7:+oo)
(3*x+5)/(7*x-8) = 16/7 // - 16/7
(3*x+5)/(7*x-8)-(16/7) = 0
(3*x+5)/(7*x-8)-16/7 = 0
(7*(3*x+5))/(7*(7*x-8))+(-16*(7*x-8))/(7*(7*x-8)) = 0
7*(3*x+5)-16*(7*x-8) = 0
163-91*x = 0
(163-91*x)/(7*(7*x-8)) = 0
(163-91*x)/(7*(7*x-8)) = 0 // * 7*(7*x-8)
163-91*x = 0
163-91*x = 0 // - 163
-91*x = -163 // : -91
x = -163/(-91)
x = 163/91
x = 163/91
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