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(5-2k)/4 = -18
Maka,
5 - 2k = -72
2k = 5 + 72
2k = 77
k = 77/2
Jika begini:
5 - 2k/4 = -18
Maka,
5 - k/2 = -18
k/2 = 5 + 18
k/2 = 23
k = 23 x 2
k = 46
20-2k=-40
-2k=-40-20
-2k=-60
-k=-30
k=30