$x^2+9x+64$
$\frac{2x^3+16^2+32x}{4x^2-64}$
$6xy-12x=0$
$4x^2-10xy-12y^2$
$2x\le7x-35-5a$
$12b\:+12b$
$2 x + 5 < 3 x$
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