$3b+2a+5c;a=-5;\:b=2;c=4$
$\left(\frac{\left(x+2x^2\right)}{\sqrt{x}}\right)$
$\:\left(-14\right)-\left(-49\right)$
$8+x-22$
$1-7+3-\left(-4\right)$
$b^2-z^2$
$3x^2-2xy;\:x=2;\:y=1$
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