$15^3a+36+54-b^3$
$\frac{dy}{dt}-2y=4-t$
$5x+4y=8$
$6x+4y=12$
$in\left(\frac{5x^2+3}{x^2}\right)$
$a^2-ab+\left(a-b\right)c$
$-\left(4xy+2y\right)^2$
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