$\left(-6\right).\left[-\left(-2\right)-3.\left(-4\right)\right]$
$\frac{15x-4}{2}<1+6x$
$-3a+4b-6a+81b-19b-2b+8a-3b+5a$
$\frac{1}{2}.\:x.\sqrt[4]{4.x.y}$
$1-b^5$
$-2\left(a\:-\:3b\right)$
$2-8v^2$
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