$$\frac{x+12}{9}-\frac{x-1}{6}=\frac{x+1}{3}.$$
$x=3$
$$2\left(x+12\right)-3\left(x-1\right)=6\left(x+1\right)$$
$$2x+24-3\left(x-1\right)=6\left(x+1\right)$$
$$2x+24-3x+3=6\left(x+1\right)$$
$$-x+24+3=6\left(x+1\right)$$
$$-x+27=6\left(x+1\right)$$
$$-x+27=6x+6$$
$$-x+27-6x=6$$
$$-7x+27=6$$
$$-7x=6-27$$
$$-7x=-21$$
$$x=\frac{-21}{-7}$$
$$x=3$$
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