$$6x-13+4x-7=-x+10+30$$
$x = \frac{60}{11} = 5\frac{5}{11} \approx 5.454545455$
$$10x-13-7=-x+10+30$$
$$10x-20=-x+10+30$$
$$10x-20=-x+40$$
$$10x-20+x=40$$
$$11x-20=40$$
$$11x=40+20$$
$$11x=60$$
$$x=\frac{60}{11}$$
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