$8-3c=8+2c$
$\left(2x^3+x^2-4\right)\cdot\left(x^2-4\right)$
$sin^2x+cos^2x-b^2$
$x^2+10x=11$
$486+106x+6x^2$
$x^2+12x+27>0$
$x^2=6x-9$
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