$18x^{a-18}+32x^{a-b+15}+18x^{c-b+16}$
$-2x^2+128=0$
$\lim_{x\to0}\left(e^x+2x\right)^{\frac{6}{x}}$
$x^2+3x+4-2x^2-2x+5+3x^2+5x-7$
$\left(8x-3\right)\left(8x+7\right)$
$3d-6da$
$\int e^{-10x}dx$
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