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51=-4z+8z+15
We move all terms to the left:
51-(-4z+8z+15)=0
We add all the numbers together, and all the variables
-(4z+15)+51=0
We get rid of parentheses
-4z-15+51=0
We add all the numbers together, and all the variables
-4z+36=0
We move all terms containing z to the left, all other terms to the right
-4z=-36
z=-36/-4
z=+9
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