$-0,4096+-0,0196+-0,5776+-0,0016+0,36+0,7396+-0,2916+-0,1156+-0,2919$
$4+2\left(-4\right)-4^2$
$+9-12+5-13+66-7-15$
$\left(-y-4\right)^2$
$a\:+\:b\:-\:12\:-\:x\:+\:2a\:$
$\frac{s^4+81}{s\left(s^2+9\right)^2}$
$\frac{28a^2b^3c}{7a^2b}$
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