$-16+m^4$
$64x^3-125y^3$
$e^{-5x^2}=6$
$\int xsec^2\left(6x^2\right)dx$
$x^2+6x=15$
$\int-\frac{5sin\left(7x\right)}{cos^4\left(7x\right)}dx$
$3x^3y+2x^2y^2-6x^2y=x^2y$
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