$27x\:+x^2$
$-7\:+\:9\:\cdot\:-3\:+\:15$
$\left(6f-6r\right)\left(2f-9r\right)$
$3xy-5xy-21y$
$7x<0$
$8\left(-3-2+5\right)+5\left(-8+9-3\right)-\left(6\left(-9\right)\right)$
$2500x+754y=900$
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