$8+4+6-9+14-12+15-49$
$-42\:x\:-6$
$20.36+20.36+6.4+20+20+20+18+5+16.23+21.57+27.72+8.69+2+5+18+22+53$
$f\left(x\right)=\frac{\left(x^{-2}-x^3\right)}{e^{5x}}$
$1\cdot\:7-\left(-7\right)$
$264,75+6$
$5\left(2.5\right)+8\left(4\right)$
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