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D( x )
x/7 = 0
x/7 = 0
x/7 = 0
1/7*x = 0 // : 1/7
x = 0
x in (-oo:0) U (0:+oo)
(x/4+4*x)/(x/7) = 56.7 // - 56.7
(x/4+4*x)/(x/7)-56.7 = 0
(17/4*x)/(1/7*x)-56.7 = 0
(17/4*x)/(1/7*x)+(-56.7*1/7*x)/(1/7*x) = 0
(17*x)/4-56.7*1/7*x = 0
-3.849999838*x = 0
(-3.849999838*x)/(1/7*x) = 0
(-3.849999838*x)/(1/7*x) = 0 // * x/7
-3.849999838*x = 0
-3.849999838*x = 0 // : -3.849999838
x = 0
x in { 0}
x belongs to the empty set
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