Matematika

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tolong Bantu ya sama caranya
tolong Bantu ya sama caranya

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  • 2a + 3a = 90
    5a = 90
    a = 90 : 5
    a = 18

    46 + a + 29 + 5a + 15 = 180
    90 + 6a = 180
    6a = 180 - 90
    6a = 90
    a = 90 : 6
    a = 15

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