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D( y )
12*y = 0
12*y = 0
12*y = 0
12*y = 0 // : 12
y = 0
y in (-oo:0) U (0:+oo)
(3*y-7)/(12*y) = 1/3 // - 1/3
(3*y-7)/(12*y)-(1/3) = 0
(3*y-7)/(12*y)-1/3 = 0
(3*(3*y-7))/(3*12*y)+(-1*12*y)/(3*12*y) = 0
3*(3*y-7)-1*12*y = 0
-3*y-21 = 0
(-3*y-21)/(3*12*y) = 0
(-3*y-21)/(3*12*y) = 0 // * 3*12*y
-3*y-21 = 0
-3*y-21 = 0 // + 21
-3*y = 21 // : -3
y = 21/(-3)
y = -7
y = -7
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