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y2 = x - 1/2
y1 - y2 = 0
mx^2 - (m+3) x - 1 -x + 1/2 = 0
mx^2 -(m+3+1) x - 1/2= 0
D = 0
(-m - 4)^2 - 4(m)(-1/2) =0
m^2 + 8m + 16 + 2m = 0
m^2 + 10m +16 = 0
(m + 2)(m + 8) = 0
m - 2 atau m = -8