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a = -4
3a - 2a = 5 - 12
a = -7
2a + 1 = a - 3
⇔2a - a + 1 - 1 = a - a -3 - 1
⇔a = -4
nomor b
12 + 3a = 5 + 2a
⇔12 - 12 + 3a - 2a = 5 - 12 + 2a - 2a
⇔a = -7