$9\left(x+3\right)=4\left(x-7\right)+5$
$6a-5x-9a+a^2x$
$\frac{cos\left(2x\right)-cos\left(x\right)}{sin\left(2x\right)+sin\left(x\right)}$
$3+csc\left(x\right)+csc\left(x\right)$
$\frac{4x^2+12x+5}{x-1}$
$3^{2^{2^{7^{0^{7^2}}}}}$
$\left(3x^2-4x+1\right)-\left(4x^2+1\right)$
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