$\frac{x}{1.9}=-4.7$
$4\left(x+2\right)^2\:-1$
$\left(a-9\right)\left(a+2\right)$
$-36+6n=-6$
$\log\left(3x+1\right)-\log\left(x-5\right)=\log\left(x+4\right)$
$\left(6x^2-m^2^x\right)\left(6x^2+m^2x\right)$
$a^4-a^3$
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