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0.75(a-18)=-6
We move all terms to the left:
0.75(a-18)-(-6)=0
We add all the numbers together, and all the variables
0.75(a-18)+6=0
We multiply parentheses
0.75a-13.5+6=0
We add all the numbers together, and all the variables
0.75a-7.5=0
We move all terms containing a to the left, all other terms to the right
0.75a=7.5
a=7.5/0.75
a=10
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