$\left(10x^2a\:+\:9bc\right)\:\left(9bc-\:10x^2a\right)\:$
$15x+7\left(x-2\right)-2\left(1+x\right)$
$x^2-7x+0$
$-\frac{cos2x\:}{sinx\:}=2sinx\:-cscx\:$
$e^{\ln\left(10.125\right)}+4$
$10-\ln\left(x\right)=8$
$\sqrt{144\cdot25}$
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