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0.5(a+17.5)=13.25
We move all terms to the left:
0.5(a+17.5)-(13.25)=0
We add all the numbers together, and all the variables
0.5(a+17.5)-13.25=0
We multiply parentheses
0.5a+8.75-13.25=0
We add all the numbers together, and all the variables
0.5a-4.5=0
We move all terms containing a to the left, all other terms to the right
0.5a=4.5
a=4.5/0.5
a=9
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