$\left(5x-3y\right)\left(6x+7y\right)$
$16z^3y^2-24z^2y^2+20z^2y^3$
$\frac { 4 } { x } = - 1$
$\frac{x}{y}=2,4$
$-\frac{5ab^2c^3}{6a^mb^nc^x}$
$5x^2-122x+901$
$\int\frac{2xy}{x^2+y^2}dy$
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