Rachele11 Rachele11

13-12-2016
Mathematics

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If 3x / 4 = 7 - x / 3, then x = what?

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jkwon23 jkwon23

13-12-2016

[tex] \frac{3x}{4} = 7-\frac{x}{3} [/tex]
[tex] \frac{3x*3}{4*3} = \frac{7*12}{12} -\frac{x*4}{3*4} [/tex]
[tex] \frac{9x}{12} = \frac{84}{12} -\frac{4x}{12} [/tex]
[tex]12*( \frac{9x}{12} = \frac{84}{12} -\frac{4x}{12} )[/tex]
[tex]9x=84-4x [/tex]
[tex]13x=84[/tex]
[tex]84/13[/tex]

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