$5a\:+\:4\:-\:2a$
$+9-12+5-\left(+1\right)+3-12-8-6-4$
$\left(2x+3\right)-11$
$m^2-5m+24$
$12x^2-6-6x$
$1778x^6-343x^3y^6z^{12}$
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