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30.5=9.5(4z+4.5)
We move all terms to the left:
30.5-(9.5(4z+4.5))=0
We calculate terms in parentheses: -(9.5(4z+4.5)), so:We get rid of parentheses
9.5(4z+4.5)
We multiply parentheses
38z+42.75
Back to the equation:
-(38z+42.75)
-38z-42.75+30.5=0
We add all the numbers together, and all the variables
-38z-12.25=0
We move all terms containing z to the left, all other terms to the right
-38z=12.25
z=12.25/-38
z=-5.4444444444444/16.888888888889
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