a.nilai x b.<ABD c.<CBD

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  • 180 = (3a + 20) + (2a - 10)
    180 = 5a + 10
    170 = 5a
    a = 34

    <ABD = 3a + 20
    = 3(34) + 20
    = 122

    <CBD = 2a - 10
    = 2(34) - 10
    = 58

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