$1\:-2a+5a$
$-\left(7x-12\right)=2\left(x-1\right)+104$
$8\left(3x+2y\right)^3$
$\frac{35xy^3}{15x^2}$
$s^2+18s+81$
$\frac{28a^2b^3c}{7a^2b}$
$\left(-2x^4\right)\left(-3x^4\right)$
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