$31-9x=11+11x$
$\frac{sin\left(x\right)+sin\left(2x\right)}{cos\left(x\right)}$
$4mn-5mn-9mn+8m^2n$
$\frac{a^2+3a+2}{a^2+5a+6}$
$3x^2+9x-30>0$
$-18x-y$
$2^3\:+\:-4^3$
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