You can put this solution on YOUR website! Let = x the unknown number, then its opposite is -x. Write the equation as we read: x-18=-5x => 6x=18 => x=3.
Answer:The unknown number is 3.
You can put this solution on YOUR website! Find a number which when decreased by 18 is 5 times its opposite.
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Let the number be "x":
Equation:
x - 18 = 5(-x)
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x -18 = -5x
6x = 18
x = 3
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Cheers,
Stan H.