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x - 4y = 11 (kali 2)
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3x + 8y = -7
2x - 8y = 22 - (kurangkan thd persamaan pertama)
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x = -29 ==> x - 4y = 11 ==> -29 - 4y = 11 ==> 4y = -29 - 11 ==> 4y = -40 ==> y = -10