-13z+2(5z-2a)= -20a+5z+40
-13z+10z-4a=-20a+5z+40
-13z+10z-5z-4a+20a=40
-8z+16a= 40
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-13z+2(5z-2a)= -20a+5z+40
-13z+10z-4a=-20a+5z+40
-13z+10z-5z-4a+20a=40
-8z+16a= 40