$\frac{x+y}{x}$
$x^2-9x-10=0$
$9x^{2-16}$
$9\left(13-x\right)-4x=5\left(21-2x\right)+9x$
$( 1 - 2 n ) ^ { 3 }$
$xe3-18xe2-8x-55$
$-6x+3y-5x+6y$
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