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February 7, 2016
Posted by **mark** on Thursday, January 1, 2009 at 5:12pm.

- Math -
**DrBob222**, Thursday, January 1, 2009 at 5:47pmLet X = the number.

7X + X^2 = 18

Rearrange to

X^2 + 7X -18 = 0

Solve for X.

You will get two answers, one positive and one negative. Both will satisfy the equation.