$5-x\le-1$
$\left(11-5x-7x^2\right)\left(25-16x^2\right)$
$z\:-\:6\left(-\:1\:+\:x\right)$
$\ln\left(x\right)=3d+5$
$-9197.96+1350$
$x^2+x-6>0$
$x^2-2\left(1\right)=1$
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