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3-0.25a=-1.5
We move all terms to the left:
3-0.25a-(-1.5)=0
We add all the numbers together, and all the variables
-0.25a+4.5=0
We move all terms containing a to the left, all other terms to the right
-0.25a=-4.5
a=-4.5/-0.25
a=+18
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