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D( x )
6*x+7 = 0
6*x+7 = 0
6*x+7 = 0
6*x+7 = 0 // - 7
6*x = -7 // : 6
x = -7/6
x in (-oo:-7/6) U (-7/6:+oo)
(7*x+13)/(6*x+7) = 20 // - 20
(7*x+13)/(6*x+7)-20 = 0
(7*x+13)/(6*x+7)+(-20*(6*x+7))/(6*x+7) = 0
7*x-20*(6*x+7)+13 = 0
-113*x-127 = 0
(-113*x-127)/(6*x+7) = 0
(-113*x-127)/(6*x+7) = 0 // * 6*x+7
-113*x-127 = 0
-113*x-127 = 0 // + 127
-113*x = 127 // : -113
x = 127/(-113)
x = -127/113
x = -127/113
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