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1=-2(7+z)-9
We move all terms to the left:
1-(-2(7+z)-9)=0
We add all the numbers together, and all the variables
-(-2(z+7)-9)+1=0
We calculate terms in parentheses: -(-2(z+7)-9), so:We get rid of parentheses
-2(z+7)-9
We multiply parentheses
-2z-14-9
We add all the numbers together, and all the variables
-2z-23
Back to the equation:
-(-2z-23)
2z+23+1=0
We add all the numbers together, and all the variables
2z+24=0
We move all terms containing z to the left, all other terms to the right
2z=-24
z=-24/2
z=-12
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