$-\left(+3\:-\:2\:-\:1\right)\:+\:\left(-5\:+\:7\:+\:4\right)$
$x^2+5x-150$
$-5ab\:para\:a=1,\:b=2\:$
$2\:+\:cos^2\left(x\right)=3sin^2\left(x\right)$
$5.16-2.28$
$\left(4mn-6mn+2y\right)+\left(5y-3mn\right)$
$1+2+3+4+5+6$
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