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6x+12.4x=3
We move all terms to the left:
6x+12.4x-(3)=0
We add all the numbers together, and all the variables
18.4x-3=0
We move all terms containing x to the left, all other terms to the right
18.4x=3
x=3/18.4
x=1/6.1333333333333
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