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4.3x+3.2-3.1x=7.8
We move all terms to the left:
4.3x+3.2-3.1x-(7.8)=0
We add all the numbers together, and all the variables
1.2x-4.6=0
We move all terms containing x to the left, all other terms to the right
1.2x=4.6
x=4.6/1.2
x=3+1/1.2
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