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15-3z=-2z
We move all terms to the left:
15-3z-(-2z)=0
We get rid of parentheses
-3z+2z+15=0
We add all the numbers together, and all the variables
-1z+15=0
We move all terms containing z to the left, all other terms to the right
-z=-15
z=-15/-1
z=+15
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