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=> 8x - 9y - 21(2x + 2y - 14)
=> 8x - 9y - (42x + 42y - 294)
Sekarang eliminasi nilai koefisien yang variabelnya sama
=> 8x - 9y - (42x + 42y - 294)
=> -34x - 51y + 294
semoga bermanfaat..
semangat:)