$$5x+(2x+3)=7x-(5-x)$$
$x=8$
$$7x+3=7x-\left(5-x\right)$$
$$7x+3=7x-5-\left(-x\right)$$
$$7x+3=7x-5+x$$
$$7x+3=8x-5$$
$$7x+3-8x=-5$$
$$-x+3=-5$$
$$-x=-5-3$$
$$-x=-8$$
$$x=8$$
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