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x-0.2x=6890
We move all terms to the left:
x-0.2x-(6890)=0
We add all the numbers together, and all the variables
0.8x-6890=0
We move all terms containing x to the left, all other terms to the right
0.8x=6890
x=6890/0.8
x=8612+0.39999999999964/0.8
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