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12+4.x=9.2
We move all terms to the left:
12+4.x-(9.2)=0
We add all the numbers together, and all the variables
4.x+2.8=0
We move all terms containing x to the left, all other terms to the right
4.x=-2.8
x=-2.8/4.
x=-1/1.42857142857
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