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4x-0.1x=500
We move all terms to the left:
4x-0.1x-(500)=0
We add all the numbers together, and all the variables
3.9x-500=0
We move all terms containing x to the left, all other terms to the right
3.9x=500
x=500/3.9
x=128+0.8/3.9
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