$15xy^3-35x^2y+20x^3y^2$
$\frac{x}{15}=-4$
$\frac{a+3}{8}+\frac{a}{5}=2$
$\cos\left(2x\right)\cos\left(4x\right)$
$\left(x-y\right)\left(x^2+y^2\right)$
$\frac{x}{-4}-7=-14$
$5^2+8^4-2^5+3^3$
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