$3c^2-4c-4=0$
$137,27\:-16,298$
$8\cdot6-3-\left(5\cdot6-6\right)$
$4a^2+9a=9$
$-26:13$
$2x^3+5x^2-7$
$3x+3y+2\left(2x-y\right)$
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