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mx²-(m+3)x-1 = x-1/2
mx²-(m+3)x-x-1+1/2 = 0
mx²-(m+4)-1/2 = 0
syarat bersinggungan --> D = 0
D = b²-4ac
(m+4)²-4.m.(-1/2) = 0
m²+8m+16+2m = 0
m²+10m+16 = 0
(m+8)(m+2) = 0
m = -8 atau m = -2
semoga membantu ya.. :)