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5+z=-2z-10
We move all terms to the left:
5+z-(-2z-10)=0
We get rid of parentheses
z+2z+10+5=0
We add all the numbers together, and all the variables
3z+15=0
We move all terms containing z to the left, all other terms to the right
3z=-15
z=-15/3
z=-5
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