$-6m+8m-2m-mn+9mn$
$5n-20$
$7y-12\cdot7y-8$
$x^2+16x=5$
$\left(40-0.7k\right)^2$
$\int_0^{\frac{\pi}{3}}\left(\sin^4\left(x\right)\right)dx$
$\left(4xy^2+5wz^2\right)^2$
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