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[tex]\displaystyle \frac{5-x}{4}-\frac{5x}{3}=7\\ \\3(5-x)-20x=84\\ 15-3x-20x=84\\15-23x=84\\-23x=84-15\\-23x=69\\x=-3[/tex]
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[tex]\displaystyle \frac{5-x}{4}-\frac{5x}{3}=7\\ \\3(5-x)-20x=84\\ 15-3x-20x=84\\15-23x=84\\-23x=84-15\\-23x=69\\x=-3[/tex]