$-8d\:+8\:d$
$\left(-55\right)-\left(-32\right)$
$\left(4x+3+5x-2\right)$
$-\left(x+1+h\right)^3$
$8x-16-7x-21$
$\left(6x^3y^4\right)^3$
$m^2+3m-4=0$
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