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D( x )
116-(2*x) = 0
116-(2*x) = 0
116-(2*x) = 0
116-2*x = 0
116-2*x = 0 // - 116
-2*x = -116 // : -2
x = -116/(-2)
x = 58
x in (-oo:58) U (58:+oo)
(788/(116-(2*x)))*(68-(2*x)) = 720 // - 720
(788/(116-(2*x)))*(68-(2*x))-720 = 0
(788/(116-2*x))*(68-2*x)-720 = 0
(788*(68-2*x))/(116-2*x)-720 = 0
(788*(68-2*x))/(116-2*x)+(-720*(116-2*x))/(116-2*x) = 0
788*(68-2*x)-720*(116-2*x) = 0
-136*x-29936 = 0
(-136*x-29936)/(116-2*x) = 0
(-136*x-29936)/(116-2*x) = 0 // * 116-2*x
-136*x-29936 = 0
-136*x-29936 = 0 // + 29936
-136*x = 29936 // : -136
x = 29936/(-136)
x = -3742/17
x = -3742/17
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