$150-45-15$
$5x+6\le5-2x$
$-4:-80$
$\left(8+x\right)^2-4\le0$
$+\left(32\right)-\left(-43\right)$
$\left(0.1a^{x+1}+\:2a^{x-2}y\right)\left(0.1a^{x+1}-\:2a^{x-2}y\right)$
$3x^2+16=0$
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