$\left(\left(-4\right)\left(+13\right)\right)\left(-2\right)$
$-2x<11$
$3^{2x}-12\left(3^x\right)+27=0$
$-5\left(-7-2-\left(1-9\right)-3+12\right)+4$
$-5t+20\ge15$
$1+\left|\left(1+x^2\right)-1\right|$
$-\left(-2\right)^2-5\left(-2\right)+7$
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