$$x/2-1/5=x/3+1/4$$
$x = \frac{27}{10} = 2\frac{7}{10} = 2.7$
$$30x-12=20x+15$$
$$30x-12-20x=15$$
$$10x-12=15$$
$$10x=15+12$$
$$10x=27$$
$$x=\frac{27}{10}$$
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