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4x-7=3.9
We move all terms to the left:
4x-7-(3.9)=0
We add all the numbers together, and all the variables
4x-10.9=0
We move all terms containing x to the left, all other terms to the right
4x=10.9
x=10.9/4
x=2+1/1.3793103448276
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