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5x+2.3=-18.8
We move all terms to the left:
5x+2.3-(-18.8)=0
We add all the numbers together, and all the variables
5x+21.1=0
We move all terms containing x to the left, all other terms to the right
5x=-21.1
x=-21.1/5
x=-4+1/4.54545454545
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