$x^2=12-x\:$
$9x^2\cdot b^2-25$
$\left(5x+4y\right)\left(3x+2y\right)$
$18x^3-9x^2$
$x^2+20x+36=0$
$\frac{1}{\cos\left(x\right)}-\frac{\cos\left(x\right)}{1+\sin\left(x\right)}=6.2671$
$\left(5+4\right)^2-\left(5-4\right)^2-54$
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