$\left(10a+9b\right)\left(10a-9b\right)$
$x+3yx-6x-2x+8xy+y-2xy$
$\int\frac{\left(x\right)}{4x^2+4}dx$
$3x+6=5x-30$
$\frac{x}{7}=-14\cdot$
$\frac{4-\left(m+n\right)^2}{2-\left(m+n\right)}$
$\left(rt\right)^{12}$
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