$5a-6b-6c-3a+2b-9c-8a-5b+11c$
$x^3-x^2+x+3$
$5a+6b+20a+5b+8c+7c$
$\left(2x^{7m}-x^m\right)^2$
$+4-7-9$
$\left(x+7\right)\left(x-7\right)x^2-49$
$dr-2dx=0$
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