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4z+19+15=-20-2z
We move all terms to the left:
4z+19+15-(-20-2z)=0
We add all the numbers together, and all the variables
4z-(-2z-20)+19+15=0
We add all the numbers together, and all the variables
4z-(-2z-20)+34=0
We get rid of parentheses
4z+2z+20+34=0
We add all the numbers together, and all the variables
6z+54=0
We move all terms containing z to the left, all other terms to the right
6z=-54
z=-54/6
z=-9
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