$5-15+4^2+1$
$\sqrt{-\frac{1}{4}}$
$-9\left(y-7\right)$
$3a^2;\:a=1$
$\left(-28:-1\right):b$
$1+2+3+4+5-6$
$6x^2-9x=9x^2-15x$
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