$x-19=5x+17$
$\left(7x+4\right)\left(4x-5\right)$
$5^2+4-2\left(6+5\right)$
$\frac{1+x}{1-x^2}$
$3+3x+0$
$14a^5b^4+9a^4b^5+-5b^5a^4$
$\sin\left(2\pi\left(770\right)\tan\left(x\right)\right)+\sin\left(2\pi\left(1209\right)\tan\left(x\right)\right)$
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