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12x+3.5x+4x+4x=12.25
We move all terms to the left:
12x+3.5x+4x+4x-(12.25)=0
We add all the numbers together, and all the variables
23.5x-12.25=0
We move all terms containing x to the left, all other terms to the right
23.5x=12.25
x=12.25/23.5
x=9.8/18.8
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