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-2.3-3x=7.3
We move all terms to the left:
-2.3-3x-(7.3)=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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