$8-9-9g+-3g$
$12x^2=-48x$
$36+21c^2-132c$
$\left(12cosx-10\right)\left(2cosx\right)$
$525\cdot525\cdot525\cdot525\cdot525\cdot525\cdot525$
$x2-81x$
$x^2+6x+9=16$
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