$( x - \frac { 1 } { 2 } ) ^ { 2 }$
$-6\left(-27\right)$
$-\frac{2}{3}a+\frac{5}{6}a-\frac{1}{6}$
$\lim_{x\to-7}x^2+9x+2$
$4x^2-8x+6$
$72y+43y+24u+21u+12u$
$-40+\left(-80-10\right)-7$
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