Answer
$\frac{1}{7}$
Work Step by Step
According to the exercise : let $a=4x,b=3x$, then $a+b=(4x+3x)=14$, thus $a=8,b=6$, thus $\frac{a-b}{a+b}=\frac{8-6}{8+6}=\frac{1}{7}$
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