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b = 3-2a
a + 2b = 6
a + 2(3-2a) = 6
a+6 -4a = 6
-3a = 0
a = 0
b + 2a = 3
b = 3
maka a-b = 0-3 = -3
a+b = 0+3 = 3
maap klo salah