$5n+2n$
$\:-2\left(\:3t\:-\:10\right)\:+\:3\left(\:-4t\:+\:20\:\right)\:$
$2a^2+3b^2\cdot2$
$x^2-6x+7\le0$
$\left(-5\right)\left(6\right)\left(-3\right)$
$7-x\le4x+12$
$2x+1y=27$
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