$2abc-\frac{1}{5}a^2b+\frac{3}{7}ab^2-5abc-\frac{1}{2}ab^2+\frac{2}{3}a^2b$
$16x^2-8xc+c^2$
$2t^2-4t+2$
$-5-2\left(-1\right)+4-\left(+6\right)$
$3x^2-2x^2+9x^2-2x^2$
$\left(3w\right)\left(w+4\right)\left(w-4\right)\left(x+x\right)$
$4^x-2^{x+2}=-3$
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