$12^2-x-1$
$\log_a\left(2x+1\right)=2$
$6b-7y+4b-3b+2y+9y+5b-7y+2b-3y$
$2\left(1+a\right)\left(-1+a\right)$
$4\cdot\left(-4\right)-3$
$\frac{dy}{dx}=\left(5x+y\right)^2$
$\left(x-3y\right)\left(-2x+y\right)$
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