$3\:+\:8g^2\:-\:5g^2\:+\:4g$
$\frac{3x^2-x}{x^2-1}$
$4\:-\:\left(9g-5\right)\:=\:-18$
$\left(x+y-3z\right)\left(x+y-2z\right)$
$25-4a^{12}$
$4x^2+9-12x^2$
$12,25+18,25+5$
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