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678.4-6.77x=18.5
We move all terms to the left:
678.4-6.77x-(18.5)=0
We add all the numbers together, and all the variables
-6.77x+659.9=0
We move all terms containing x to the left, all other terms to the right
-6.77x=-659.9
x=-659.9/-6.77
x=97+1/2.1090342679127
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