$\left(3x^5\:+\:8x\:-10\right)\:-\:\left(5x\:-\:3x\:+2\right)$
$125-\left(14+6-22\right)-16-9$
$81a^7+24a^5$
$5-3+7-1+9-11-34$
$8-\left(-5-3\cdot4+5\left(8-\left(6-1\right)\cdot3+\left(2-5\right)\cdot4\right)\right)$
$x^2+55x-750=0$
$51,6-0,624$
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