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2a - 7b =45 ⇔ (dikurangi)
12b = -24
b = -24/12 = -2
2a - 7b = 45
2a - 7(-2) = 45
2a + 14 = 45
2a = 25 - 14
2a = 11
a = 11/2 = 5,5