$-4x\left(-2x^3+3a\right)$
$2+3\cdot\left(4\cdot\left(-1\right)-\left(3-7\right)\right)$
$x^4-2x^3-13^2-14x+27$
$18-3+5\cdot4-1-12\cdot2$
$204,25\:-\:67,48$
$3x^2yz+6xz-9yz$
$\frac{d^3y}{dx^3}=2x$
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