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7(z+1)-5z=-3
We move all terms to the left:
7(z+1)-5z-(-3)=0
We add all the numbers together, and all the variables
-5z+7(z+1)+3=0
We multiply parentheses
-5z+7z+7+3=0
We add all the numbers together, and all the variables
2z+10=0
We move all terms containing z to the left, all other terms to the right
2z=-10
z=-10/2
z=-5
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