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2a-a = 4+4
a=8
b. 2k - 3k = 6-9
-k = -3
k = 3
maaf kalo salah :')
2a-4=a+4
2a-a=4-4
a=0
2k-6=3k-9
2k-3k=-9+6
-k=-3
k=3