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-2 = -4-8/3a-5a
-2 = -12/ -3a
6a = -12
a = -12/6
a = -2
koordinat A
a = ( 5a,8)
= (5(-2),8)
= (-10,8)
koordinat b
b = (3a,-4)
= (3(-2) , -4)
= (-6, -4)