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6.8+0.8x=0.4
We move all terms to the left:
6.8+0.8x-(0.4)=0
We add all the numbers together, and all the variables
0.8x+6.4=0
We move all terms containing x to the left, all other terms to the right
0.8x=-6.4
x=-6.4/0.8
x=-8
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