$3r^2+42rz+49r^2$
$-x^2+6x-13$
$x-30=35$
$sen\:x\:\frac{dy}{dx}+\left(cosx\right)y=1$
$8x\:+\:y\:+\:z\:+\:u\:+\:-3x\:-4y\:-2z\:+3u+4x\:+\:5y\:+\:3z\:-4u\:\:\:+9x\:+\:y\:+z\:+\:2u.$
$\frac{\tan\left(8x\right)-\tan\left(7x\right)}{1+\tan\left(8x\right)\tan\left(7x\right)}$
$89xy^3\left(11x^6y\right)$
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