$-3z+x+z-2y+2z+8$
$\frac{x^4}{81}-\frac{25}{49}$
$7x^3y^2+11x^3y^2$
$6\left(x-6\right)-8x=-18$
$\left(\sqrt{a}\right)^5\cdot\left(\sqrt{a}\right)^3\cdot\left(\sqrt{a}\right)$
$9x-4\ge12x+9$
$\lim_{x\to0}\left(\frac{x-xcos\left(11x\right)}{sin^2\left(2x\right)}\right)$
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