$5b-10c$
$-1^2-5-1$
$31-9x=11+11x$
$4x^2-20x-24y=-97$
$64b^2-80b+36$
$\left(\frac{2x^3}{3}-\frac{3}{2}x^4\right)\left(\frac{2x^3}{3}+\frac{3}{2}x^4\right)$
$-3+7-\left(-9\right)+1-5$
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