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4+2z=-6z
We move all terms to the left:
4+2z-(-6z)=0
We get rid of parentheses
2z+6z+4=0
We add all the numbers together, and all the variables
8z+4=0
We move all terms containing z to the left, all other terms to the right
8z=-4
z=-4/8
z=-1/2
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