$-2\:-8\:+\:4\:-2^2$
$3x^{-3}y^{-3}\cdot4x^3y^4$
$\left(xy^2+x-7\right)dx+\left(y+x^2y-1\right)dy=0$
$16x-7=11x-32$
$0.375-0.225$
$\frac{6}{8^{-2}}$
$\left(6a^2x+4a-3x^2a-2ax\right)\cdot\left(ax-3a\right)$
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