$754+98$
$\frac{1}{sin\left(x\right)cos\left(x\right)}\:.\:\left(\cos\left(x\right)+\sin\left(x\right)\right)$
$\left(6\:-\:17\right)\:.\:\left(-21\:+\:17\right)$
$3a^2+2b^3-2a^2-5b^3$
$7.x=98$
$5x-2<16-4x$
$n^2-n$
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