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12.4*x=78.3
We move all terms to the left:
12.4*x-(78.3)=0
We add all the numbers together, and all the variables
12.4x-78.3=0
We move all terms containing x to the left, all other terms to the right
12.4x=78.3
x=78.3/12.4
x=6+1/3.1794871794872
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