7 times a number is 18 less than twice the opposite number what is the number?

Please help me I've been trying to figure it out all day! the question is : 7 times a number is 18 less than twice the opposite number what number is it?
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1 Answer

The opposite of a number (its additive inverse) is -n if n is the number.

So 7n=2(-n)-18,

7n=-2n-18,

9n=-18,

n=-18/9=-2.

The number is -2.

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