$12 \cdot 3 + 18 : ( - 2 + 8 )$
$\frac{-15a^4b^7}{45a^2b^2}$
$\left(3x^2+6^2\right)$
$4+\left|6\right|$
$2cos2x+3=4$
$12x^2-18x+6$
$3\left(n+1\right)=5\left(n-3\right)$
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