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  • 3a + 2b = 14
    4b + 5 = 21
    4b = 21-5
    4b = 16
    b = 4
    3a + 2×4 = 14
    3a + 8 = 14
    3a = 6
    a =2
    a+b = 2+4 = 6 e

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