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----------- = ------------
xL - xK xM - xL
-3-3 a-(-3)
------ = --------
1-(-2) 4-1
-6 a+3 lalu dikali
--- = ----- silang
3 3
3(a+3) = -6(3)
3a+9 = -18
3a = -18-9
3a = -27
a = -27:3
a = -9