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D( m )
3*m+1 = 0
3*m+1 = 0
3*m+1 = 0
3*m+1 = 0 // - 1
3*m = -1 // : 3
m = -1/3
m in (-oo:-1/3) U (-1/3:+oo)
70/(3*m+1)+18 = 4 // - 4
70/(3*m+1)-4+18 = 0
70/(3*m+1)+(-4*(3*m+1))/(3*m+1)+(18*(3*m+1))/(3*m+1) = 0
18*(3*m+1)-4*(3*m+1)+70 = 0
54*m-12*m+18+66 = 0
42*m+84 = 0
(42*m+84)/(3*m+1) = 0
(42*m+84)/(3*m+1) = 0 // * 3*m+1
42*m+84 = 0
42*m+84 = 0 // - 84
42*m = -84 // : 42
m = -84/42
m = -2
m = -2
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