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8.1-3x=-1.5
We move all terms to the left:
8.1-3x-(-1.5)=0
We add all the numbers together, and all the variables
-3x+9.6=0
We move all terms containing x to the left, all other terms to the right
-3x=-9.6
x=-9.6/-3
x=3+0.6/3
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