tay12345 tay12345

13-11-2014
Mathematics

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what is the solution to 2x+12=5x-9

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13-11-2014

[tex]2x+12=5x-9\ \ \ \ |combine\ like\ terms\\\\2x-5x=-9-12\ \ \ \ \ |simplify\\\\-3x=-21\ \ \ \ \ |:-3\\\\x=7[/tex]

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apologiabiology apologiabiology

13-11-2014

so 2x+12=5x-9
you want all of the unknowns on one side and all of the known values on the other or
subtract 2x from both sides
12=3x-9
add 9 to both sides
21=3x
divide both sides by 3
7=x

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