$2p+1-1$
$\left(3\right)\left(2\right)\left(3\right)\left(1\right)$
$7x^2+21y$
$1.5y\:+\:3.5y\:=\:25$
$-\frac{s}{s^3-8}$
$5^2\cdot\left(-5\right)^3$
$a+2a+5b+a-2b$
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