$\:y=\frac{1}{x^2},\:x=1,\:x=3$
$+b^2-b^2-b^2$
$\frac{4z^2-252z+3969}{49}$
$-6yn\cdot4n^3$
$-14x^2\:+\:12x\:+\:26$
$3x^{-2}+2x^{-2}$
$27\left(-24\right)$
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