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D( x )
2*x-3 = 0
2*x-3 = 0
2*x-3 = 0
2*x-3 = 0 // + 3
2*x = 3 // : 2
x = 3/2
x in (-oo:3/2) U (3/2:+oo)
(x+6)/(2*x-3) = 7/10 // - 7/10
(x+6)/(2*x-3)-(7/10) = 0
(x+6)/(2*x-3)-7/10 = 0
(10*(x+6))/(10*(2*x-3))+(-7*(2*x-3))/(10*(2*x-3)) = 0
10*(x+6)-7*(2*x-3) = 0
81-4*x = 0
(81-4*x)/(10*(2*x-3)) = 0
(81-4*x)/(10*(2*x-3)) = 0 // * 10*(2*x-3)
81-4*x = 0
81-4*x = 0 // - 81
-4*x = -81 // : -4
x = -81/(-4)
x = 81/4
x = 81/4
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