$3.\left(2-8\right)+\left(-5\right)^2-\left(1-7\right)$
$\left(-x\right)\cdot\left(-x\right)\cdot\left(-x\right)+3\cdot2\cdot x^2-3\cdot2\cdot x^2+2^3$
$\left(\sqrt[7]{a}\right)^2$
$6x^2-5x-6=0$
$4\left(-36+9y\right)=72$
$x^2u\left(x-1\right)$
$\left(\sin a+\csc a\right)^2+3$
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