$\frac{2\cdot2.1289}{1-2.1289}$
$100-169x^8$
$3x^2-9x-6$
$9x-7y=-7$
$\int x\left(4x+9\right)^{10}dx$
$\log\left(x-7\right)-\log\left(7\right)=\log\left(11\right)$
$2x^2+18x=-3$
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