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4z-2z=-6*5
We move all terms to the left:
4z-2z-(-6*5)=0
We add all the numbers together, and all the variables
4z-2z-(-30)=0
We add all the numbers together, and all the variables
2z+30=0
We move all terms containing z to the left, all other terms to the right
2z=-30
z=-30/2
z=-15
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