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-4z+20=-6z
We move all terms to the left:
-4z+20-(-6z)=0
We get rid of parentheses
-4z+6z+20=0
We add all the numbers together, and all the variables
2z+20=0
We move all terms containing z to the left, all other terms to the right
2z=-20
z=-20/2
z=-10
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