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x+0.25x-12=-3
We move all terms to the left:
x+0.25x-12-(-3)=0
We add all the numbers together, and all the variables
1.25x-9=0
We move all terms containing x to the left, all other terms to the right
1.25x=9
x=9/1.25
x=7+0.25/1.25
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