$2x^2\:-\:60x\:+\:45$
$x\cdot3y=-1$
$x-4=19$
$\frac{2x^3-5x^2+6x-3}{x+2}$
$\frac{6x^3+19x^2-17x^1-18}{3x^1+2}$
$\frac{1}{5}\:\left(15+10k\right)$
$26-4x=9x$
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