$43\cdot57$
$x+3x=88$
$5-\left(-7\right)-9+1-6-\left(-8\right)+3+\left(-20\right)$
$5-4x=-11$
$-3=-2+\tan\left(x\right)$
$\ln\left(2x+15\right)-\ln\left(x\right)=\ln\left(3\right)$
$\frac{5ab}{\left(a^ob^2\right)^4}$
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