$\int7x^2\cdot sin\left(6x\right)dx$
$\frac{8-1}{2}y$
$x+13=221$
$\sqrt{\frac{x-3}{x^4+4}}$
$xy-4x+3x^2=7$
$4a\:-\:3\:+\:6a$
$\frac{1+x^2+x}{2x-2}$
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