$-1\:\left(23\right)+5$
$\int8b\left(2-3b\right)db$
$-2\left(-3x^2-2x+4\right)+2\left(-2x^2+3x+3\right)$
$2a\cdot2a$
$\int\frac{9e^{9t}}{7+e^{9t}}dt$
$\left(7x^{12}+13\right)^2$
$x+10-10$
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