$x-3\le5x+2$
$1-27b^2+b^4$
$5x^2-100xy+500y^2$
$y=5\sqrt{x^2}$
$\left(3x+15y\right)^3$
$9\:cos^2x\:=\:12\:cos\:x\:-\:4$
$x+2y=100$
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