$7.4 z - 5 ( - 1.6 z + 2.4 )$
$\left(-24\right)\left(6\right)$
$5x^2+3=-2$
$\int\cos^n\left(x\right)sen\left(x\right)dx$
$a^4+2a^2+24$
$\lim_{x\to\infty}\left(\frac{2x^2+3x}{x^2+x+1}\right)$
$x-1<16$
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