the sum of twice a number and 18 less than the number is the same difference between -30 and the number. What is the number?

asked Feb 1, 2016 228k views

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x - the number

$2x+x-18=-30-x \\ 3x-18=-30-x \\ 3x+x=-30+18 \\ 4x=-12 \\ x=(-12)/(4) \\ x=-3$

The number is -3.

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