$a-15>-4\left(-6+3a\right)$
$7a-8b=8$
$4k^2+16k+25$
$\frac{4x^2-12x+5}{x-1}$
$4x-2=x+10$
$3r-6r$
$\lim_{x\to1}2x^2+6x+11$
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