$-2+5x-1y+2x-1$
$m2+4m+4$
$98,42\:x\:10^3\:.\:4,73\:x\:10^2$
$-\frac{4}{2\left(-1\right)}$
$\frac{x^3+4x^2+3x}{2}$
$6x^2+8x+2$
$\left(3a^4+b^3c\right)^2$
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