$8y^2+4y+1-\left(2y^2-7y-1\right)$
$\lim_{x\to-4}\frac{3}{4}x^3+2x+1$
$a^2+2ab+b^2=121$
$3x^2+2x^4+3+4x-4x^6+2$
$3x^4\left(2x^2-1\right)$
$c^{2+10c+25}$
$4\ln\left(7x+2\right)-7=-15$
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