$\left(2a-3b\right)\left(2a\right)$
$-2+7-\left(3-\left(-5+8\right)-7+\left(-5+3-8\right)-\left(-5+3\right)\right)$
$43-29-65-\left(-83\right)+78$
$b6\cdot bn$
$\ln\frac{3}{x}\:=2$
$\left(y-6\left(y-8\right)\right)$
$-2\sin\left(x\right)\cdot\cos\left(x\right)$
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