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3.4x-7.2x=3
We move all terms to the left:
3.4x-7.2x-(3)=0
We add all the numbers together, and all the variables
-3.8x-3=0
We move all terms containing x to the left, all other terms to the right
-3.8x=3
x=3/-3.8
x=-1/1.2666666666667
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