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What is

3x-9=-x+7

 Sep 8, 2016
 #1
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3x-9 = -x+7  --> add x to both sides

4x-9 = 7       --> add 9 to both sides

4x = 16        --> divide both sides by 4

x = 4

 Sep 8, 2016
 #2
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4cheekyx=b±b24ac2aΔ

 Sep 8, 2016

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