$ab\cdot\left(10ab+9b-a\right)$
$a^2+7a+14$
$3x+y=2$
$x\:+\:2y-3z=4$
$5 - ( ( 8 - 6.3 ) + 1 ( 5 \cdot - 3 + 5 ) - 7 )$
$\int\tan\left(4x\right)^2\cos\left(4x\right)^4dx$
$\frac{x^4x^{-2}}{x^{-5}}$
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