$\frac{x^2-x-1}{x-1}$
$5x-y=-2$
$3xy+3ym-3ay$
$2\sin\left(x\right)\cos\left(x\right)\cos\left(2x\right)$
$x^2-1.8x+0.81$
$10-3-f+5f-3$
$a+b+a+b$
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