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-8-(-7y-3y-5z-2t)
-8-(-10y-5z-2t)
-8 (10y+5z+2t)
-80y-40z-16t
-8+7y-6y+4z-2t+3y-5z+3
-8+3+7y-6y+4z-5z-2t
-5+y-z-2t