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Solve the equation: |(15 - x,1,10),(11 - 3x,1,16),(7 - x,1,13)| = 0

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Solve the equation: |(15 - x,1,10),(11 - 3x,1,16),(7 - x,1,13)| = 0

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Given that |(15 - x,1,10),(11 - 3x,1,16),(7 - x,1,13)| = 0

or, |(15 - x,1,10),(-4 - 2x,0,6),(-8,0,3)| = 0

or, (-1)(-12 - 6x + 48) = 0 

or, 6x - 36 = 0

∴ x = 6

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