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Hello, what is an easy way to figure out an equation like this?

(-4)x__ = +4 in the question you must fill in the blank but i need a quick and easy way to find the sum.
 Jan 29, 2012
 #1
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[input](-4)*x = +4[/input]

(-4)*x = +4 |/(-4)
x = +4 / (-4) = -1
 Jan 29, 2012
 #2
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x=_1
 Jan 29, 2012

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