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4a + 3b = -11
menyamakan variabel a untuk eliminasi menjadi
8a - 20b = 4
8a + 6b = -22
------------------- -
-26b = 26
b = -1
2a - 5b = 1
2a -5(-1) = 1
2a + 5 = 1
2a = 1 - 5
2a = -4
a = -2