$x^2-2x=8$
$3senx=1+2senx$
$\left(4m^5-5n^3\right)^2$
$\left(-18\right)-\left(+7\right)+\left(-19\right)-\left(-12\right)+\left(-1\right)$
$\left(3m+6\right).\left(3m-2\right)$
$\left(xy^2-5xy^3\right)$
$\left(4b+5y\right)\left(4b-5y\right)$
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