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9+5(1-2.5z)=15.5
We move all terms to the left:
9+5(1-2.5z)-(15.5)=0
We add all the numbers together, and all the variables
5(-2.5z+1)+9-(15.5)=0
We add all the numbers together, and all the variables
5(-2.5z+1)-6.5=0
We multiply parentheses
-10z+5-6.5=0
We add all the numbers together, and all the variables
-10z-1.5=0
We move all terms containing z to the left, all other terms to the right
-10z=1.5
z=1.5/-10
z=-1/6.66666666667
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