$x2\left(4x\:4+6\right)\:$
$\left(2m^2+3b^2\right)^2$
$\frac{6x^3+31x^2-30x}{x^3-x^2-42x}$
$\left(3x-1\right)\left(4x+6\right)$
$-\left(12\right)+\left(-\left(-12\right)\right)$
$b+b$
$x^2+x=-2$
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