$12-\left(24-\:\left(-12+\:\left(-8+18-6\right)\right)\right)$
$b^2-18b+81$
$689-\left(-900\right)$
$\int\cos\left(12x\right)\sin\left(12x\right)dx$
$-\frac{3}{4}x-\frac{5}{4}x$
$\int e^{2-5x}dx$
$-3x+2y=7$
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