$$2 \cdot 5 x + 7 x - 3 = 5 x + 7$$
$x=\frac{5}{6}\approx 0.833333333$
$$10x+7x-3=5x+7$$
$$17x-3=5x+7$$
$$17x-3-5x=7$$
$$12x-3=7$$
$$12x=7+3$$
$$12x=10$$
$$x=\frac{10}{12}$$
$$x=\frac{5}{6}$$
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