$sin2\left(x\right)=2sin\left(x\right)cos\left(x\right)$
$-5m+2m-3m$
$8d-\left(-3d\right)+\left(-7\right)-2$
$\left(2y-7\right)^3$
$3x-4+-8x+6$
$m-1+m-7$
$\left(7x+2y\right)\left(7x-2z\right)$
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