$7x\:+10x\:=\:34$
$\lim_{x\to0}\left(5secx-5tanx\right)$
$3.n=51$
$\left(4m^2+6n^4\right)$
$2x^3-x^3$
$-2x^2+x+1$
$6x^2+6x$
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