$1m-1n+1y$
$64x^3\:+\:16x^2\:+\:x$
$\left(2x-3\right)^2-\left(2x+3\right)^2+\left(3x+4\right)^2-8x^2-16$
$5ab-a^2b+5-ab+4$
$15x\cdot15x$
$7m+8=71$
$y''+16y=0$
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