$9x^2-42x\:-49$
$\frac{d^2x}{dx^2}=2x+3$
$\lim_{x\to0}\left(\frac{\left(2+x\right)^2-4}{x}\right)$
$\int ( a + b x ) ^ { 2 } d x$
$3bx+4y-6bx+3y+9xb+bx$
$\frac{x^2-3x-3}{x-1}$
$-4\left(a+3\right)$
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