$xy'\:+\:2y\:=\:15x^3\:+\:9x$
$8n+3\left(-n-3\right)$
$\int sec37w\cdot tan37w\:dw$
$15x^2=20$
$\left(3a-a^2\right)\left(3a+a^2\right)$
$\left(1+i\right)\left(1+i\right)\left(1+i\right)\left(1+b\right)$
$x^2-3x^2-28$
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