$4x^2+14x-2x-7+2x^2-10x+6$
$3\left(2n\right)$
$2^2-\left(-1\right)^4$
$\frac{\left(3^n+\left(-2\right)^n\right)}{n+1}\cdot\:\:x^n$
$4x+7\ge8x-3$
$2-\sqrt{4}-x$
$12x\left(-9\right)x\left(-9\right)$
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