$-3\left(\left(-4-b\right)\left(1+b\right)+1\right)-8b$
$\left(2x\:-\:8\right)\:.\:\left(2x\:+\:5\right)$
$\int_{-2}^3\left(\frac{21}{x^4}\right)dx$
$3y-7+4x=28$
$\int\frac{4x^2-15x+6}{\left(x+3\right)\left(x-2\right)x}dx$
$\int6x^2\arcsin\left(2x\right)dx$
$0.25-0.75$
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