$$(3x)3-(2x+5)4=(5)6$$
$x=50$
$$9x-\left(2x+5\right)\times 4=5\times 6$$
$$9x-\left(8x+20\right)=5\times 6$$
$$9x-8x-20=5\times 6$$
$$x-20=5\times 6$$
$$x-20=30$$
$$x=30+20$$
$$x=50$$
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