$$3x+2(x+2)+2x-5=20$$
$x=3$
$$3x+2x+4+2x-5=20$$
$$5x+4+2x-5=20$$
$$7x+4-5=20$$
$$7x-1=20$$
$$7x=20+1$$
$$7x=21$$
$$x=\frac{21}{7}$$
$$x=3$$
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