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1/2 ( 2x + 9 ) x 10 = 85

  • maths -

    1/2(2x+9)*10=85
    multiply through by 1/2
    (x+9/2)*10=85
    10x+45=85
    10x=85-45
    10x=40
    10x/10=40/10
    x=4

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