$\left(7a+3c\right)\left(7a-3c\right)$
$x^2+34=0$
$3\cos\left(x\right)^2+4\sin\left(x\right)+1=0$
$xy'+y=x^2y^2$
$-4\cdot3\cdot3$
$9-\frac{1}{3}x=2$
$4c+5c+10$
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