-13z+2(5z-2a)=-20a+5z+40
-13z+2(5z-2a)=20a+5z+40 -13z+10z-4a=20a+5z+40 -3z-5z=-20a+4a+40 -8z=-16a+40 /(-8) z=2a-5
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-13z+2(5z-2a)=20a+5z+40
-13z+10z-4a=20a+5z+40
-3z-5z=-20a+4a+40
-8z=-16a+40 /(-8)
z=2a-5