$a^4x-b^4x-2b^2x$
$y^2y'=1$
$\left(x+1\right)\left(x+2\right)\left(x+3\right)\ge x^3+6x^2+10x+12$
$4w^2+4w+1=121$
$4x^2-80=0$
$7\cdot2-4\cdot4$
$\frac{900}{\left(x+4\right)^2}-1$
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