$\frac{4}{a^2}-\frac{5}{a^2}-\frac{9}{a^2}$
$70.0856+0.000012+0.00006+0.00005+0.00004+0.000022$
$\left(4x+2x^3\right)\left(4x-2x^3\right)$
$\left(4x^2+3b^3\right)^5$
$5\left(10-2r\right)-5\left(r-5\right)$
$\frac{-3x^3+4x^4+2x-1}{x+2}$
$x^2+8x=3$
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