$\left(2v-6z\right)^2$
$\frac{dy}{dx}=\frac{x+y+2}{x+y+1}$
$-20ab+11ab$
$400p^2q^4-225d^6$
$8x+3+4x+2$
$58,5\cdot73-58.6+\frac{2,23}{4,7}$
$3x+6y-6z=9$
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