$-3x+4;\:x=1$
$\frac{1}{2}x+\frac{3}{5}y-\frac{7}{9}z\:-\:-\frac{3}{5}y+\frac{1}{2}z-\frac{1}{2}$
$10x^2+24x\:-\:18$
$\frac{\left(3x^6\right)}{6}$
$2\left(2+1\right)$
$-4cos\left(3x\right)sen\left(x\right)$
$\frac{-30k^4}{3k^3}$
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