$2y^2-13y+20=0$
$5-16+7+\left(-1\right)$
$3u-27$
$\left(12-3x\right)\left(y-1\right);\:x=4;\:y=3$
$\left(10x^3+3x^2-2x+6\right)-\left(10x^3+2^2-20\right)$
$4x^2-8+4$
$-4.39\left(-8.76\right)$
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