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D( x )
4*x+7 = 0
4*x+7 = 0
4*x+7 = 0
4*x+7 = 0 // - 7
4*x = -7 // : 4
x = -7/4
x in (-oo:-7/4) U (-7/4:+oo)
(x-1)/(4*x+7) = 1/5 // - 1/5
(x-1)/(4*x+7)-(1/5) = 0
(x-1)/(4*x+7)-1/5 = 0
(5*(x-1))/(5*(4*x+7))+(-1*(4*x+7))/(5*(4*x+7)) = 0
5*(x-1)-1*(4*x+7) = 0
x-12 = 0
(x-12)/(5*(4*x+7)) = 0
(x-12)/(5*(4*x+7)) = 0 // * 5*(4*x+7)
x-12 = 0
x-12 = 0 // + 12
x = 12
x = 12
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