$5x^7\:-\:6x^6\:+\:3x^5$
$-72\cdot12$
$\left(7+6\right)-\left(9-8\right)$
$-28-+18+35-16+-42$
$\left(6x+7\right).\left(2x-3\right)$
$\left(34+2x\right)\left(50+2x\right)$
$9ab-5ab$
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