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28 September, 18:48

Whats the value of x?

(12x+12) + (3x+19) = 165

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  1. 28 September, 22:10
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    For: (12x+12) * (3x+19) = 165

    36x² + 228x + 36x + 228 = 165

    36x² + 264x + 63 = 0

    x₁ = (-264 + 246) / 72 = - 0.25

    x₂ = (-264 - 246) / 72 = - 7.08

    for: (12x + 12) + (3x + 19) = 165

    12x + 12 + 3x + 19 = 165

    15x + 31 = 165

    15x = 134

    x = 8.9
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