$42x^2+30y^2=10$
$9x^2y^4z^4-27xy^3z^4$
$x^2-22x+42$
$\int\left(7e^{-5y}\left(3+e^{-5y}\right)^3\right)dy$
$\left(\sqrt{\frac{x}{y}}+\sqrt{\frac{x}{y}}\right)^2$
$2-\:\left(-15\right)+10$
$x^2-bx$
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