$$\frac{3}{4}x+2x=7+14$$
$x = \frac{84}{11} = 7\frac{7}{11} \approx 7.636363636$
$$\frac{11}{4}x=7+14$$
$$\frac{11}{4}x=21$$
$$x=21\times \frac{4}{11}$$
$$x=\frac{21\times 4}{11}$$
$$x=\frac{84}{11}$$
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