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Answer:
a = 6 , b = -9
Step-by-step explanation:
2a + b = 3
b = -2a + 3
3a + 2(-2a + 3) = 0
3a - 4a + 6 = 0
-a = -6
a = 6
2(6) + b = 3
12 + b = 3
b = -9