$-17\:+\:-12\:+\:0\:=\:$
$-10\:+\:\left(-5\right)\:+\:7-\left(-3\right)\:+6\left(10\right)$
$3+\tan^2\left(x\right)=\frac{1}{\cos^2\left(x\right)}$
$n^2-28n$
$x+3xy-6x-2x+8xy-y-2xy$
$\left(2x^2+x\right)^5$
$3\left(2-x\right)<7$
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