$9x^2+16y^2=49$
$9\:+\:9n\:=\:7n\:-\:1$
$c\:0$
$3x^2\left(5x^2-9xy-2y^2\right)$
$\left(5a-7\right)x\left(5a+7\right)$
$\left(3i+j\right)\left(2i-j\right)$
$\left(3x^2+3\right)^{-\frac{2}{5}}$
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