$$\frac { 3 } { 2 } x - \frac { 5 } { 4 } y - \frac { 7 } { 2 } z \frac { 2 } { 3 } x + \frac { 3 } { 2 } y - \frac { 4 } { 3 } z$$
$-\frac{7xz}{3}+\frac{y}{4}+\frac{3x}{2}-\frac{4z}{3}$
$$\frac{3}{2}x-\frac{5}{4}y-\frac{7\times 2}{2\times 3}zx+\frac{3}{2}y-\frac{4}{3}z$$
$$\frac{3}{2}x-\frac{5}{4}y-\frac{7}{3}zx+\frac{3}{2}y-\frac{4}{3}z$$
$$\frac{3}{2}x+\frac{1}{4}y-\frac{7}{3}zx-\frac{4}{3}z$$
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$\frac{-28xz+18x+3y-16z}{12}$
$$\frac{18x-15y-28zx+18y-16z}{12}$$