$5.3\:-\:y\:+\:4.2\:$
$-7x^2+17x+12$
$6x\cdot9$
$2\left(5x-9\right)-4\left(x-3\right)$
$\left(2x^3\:+5yz^2\right).\left(2x^3\:+5yz^2\right)$
$36x^8b^{12}-9c^{10}$
$25+70w-47w^2$
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