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5x-2.4=3.9
We move all terms to the left:
5x-2.4-(3.9)=0
We add all the numbers together, and all the variables
5x-6.3=0
We move all terms containing x to the left, all other terms to the right
5x=6.3
x=6.3/5
x=1+1/3.84615384615
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