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4.5x-2.3x=12
We move all terms to the left:
4.5x-2.3x-(12)=0
We add all the numbers together, and all the variables
2.2x-12=0
We move all terms containing x to the left, all other terms to the right
2.2x=12
x=12/2.2
x=5+1/2.2
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