$\left(5y-1\right)\left(3x+3\right)$
$4a+3-5a=4$
$\frac{\left(28x^2-\:332x\right)}{\left(4x\right)}$
$\lim_{x\to7}\left(\frac{5x-2}{\sqrt{x+2}}\right)$
$\left(x^2+6x+9\right)\left(x^2-4x+4\right)$
$7\sin\left(2x\right)=4\sin\left(x\right)$
$2tan^2x+5tanx-2=0$
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