$\log\left(4\right)=\log\left(x-1\right)-\log\left(3\right)$
$\left(2d+m\right)\left(4d^2-2dm+m^2\:\right)$
$6.2\left(-8.\right)$
$100x^2+80xy+4y^2$
$2x-5=x+25$
$3^4.5^4$
$17u+20+11u-18$
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