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b^2 - 4ac < 0
(4)^2 - 4 (1) (10-7m) < 0
16 - 40 + 28m < 0
28 m < 24
m < 1/2
x^2+4x+10-6m=0
tidak memiliki akar,,,jika D<0
4^2-4(1)(10-6m)<0
4-(10-6m)<0
2-(5-3m)<0
-3+3m<0
3m<3
m<1