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x-0.1x=128.68
We move all terms to the left:
x-0.1x-(128.68)=0
We add all the numbers together, and all the variables
0.9x-128.68=0
We move all terms containing x to the left, all other terms to the right
0.9x=128.68
x=128.68/0.9
x=142+0.88000000000001/0.9
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