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2(z+10)+-7=-1
We move all terms to the left:
2(z+10)+-7-(-1)=0
We add all the numbers together, and all the variables
2(z+10)-6=0
We multiply parentheses
2z+20-6=0
We add all the numbers together, and all the variables
2z+14=0
We move all terms containing z to the left, all other terms to the right
2z=-14
z=-14/2
z=-7
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