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a(2-2.5)=3
We move all terms to the left:
a(2-2.5)-(3)=0
We add all the numbers together, and all the variables
a(-0.5)-3=0
We multiply parentheses
-0.5a-3=0
We move all terms containing a to the left, all other terms to the right
-0.5a=3
a=3/-0.5
a=-6
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