$3x<51-x$
$-7mn\:+\:3mn$
$6x^4-7x^3+2x^2+13x^2-8x+6$
$1+\tan\left(x\right)=\sec\left(x\right)\cdot\cos\left(x\right)$
$\frac{4x^2-2x+5}{2x+2}$
$15+150xsenx+5$
$\:65x+-5x\:-6x+11x$
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