$4x^2+4x-5$
$-18x^3+78x^2+54x-26$
$9\cdot5-12\cdot7+6\cdot11$
$8\cdot15x\cdot1\cdot1x-5\cdot15x-5\cdot1$
$11r\:-\:7r\:+\:11r$
$\frac{x}{9}-\frac{y}{9}$
$\int\frac{7}{xln9x}dx$
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