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2(z+1)-5(z-3)=5
We move all terms to the left:
2(z+1)-5(z-3)-(5)=0
We multiply parentheses
2z-5z+2+15-5=0
We add all the numbers together, and all the variables
-3z+12=0
We move all terms containing z to the left, all other terms to the right
-3z=-12
z=-12/-3
z=+4
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