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0.75(2a-4)=9
We move all terms to the left:
0.75(2a-4)-(9)=0
We multiply parentheses
1.5a-3-9=0
We add all the numbers together, and all the variables
1.5a-12=0
We move all terms containing a to the left, all other terms to the right
1.5a=12
a=12/1.5
a=8
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