$\int\:4.a^9.x^7dx$
$\left(8b^2c-3cd\right)^3$
$\lim_{x\to7}\left(\frac{2-\sqrt{x+3}}{x^2-49}\right)$
$6x+3\left(-x+11\right)=3$
$\left(v^3\right)^4\left(w^2\right)^2$
$4x=2\left(66-x\right)-12$
$3\cdot1-3$
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