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-4(5-7)+15z=-5z
We move all terms to the left:
-4(5-7)+15z-(-5z)=0
We add all the numbers together, and all the variables
15z-(-5z)-4(-2)=0
We add all the numbers together, and all the variables
15z-(-5z)+8=0
We get rid of parentheses
15z+5z+8=0
We add all the numbers together, and all the variables
20z+8=0
We move all terms containing z to the left, all other terms to the right
20z=-8
z=-8/20
z=-2/5
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