$7\:-\:8\:+\:4\:-\:10\:+\:6$
$\int\frac{2}{x\sqrt{25x^2-64}}dx$
$\frac{a^2-7a+6}{a^2+10a-6}$
$9x\left(x+4\right)-3\left(x^2+4\right)$
$5x^3-3x^4+2x^2+7x^4$
$\left(18\right)\left(4\right)+\left(18\right)\left(-2\right)\left(11\right)$
$15\cdot80+30$
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