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x+0.2*x=500
We move all terms to the left:
x+0.2*x-(500)=0
We add all the numbers together, and all the variables
1.2x-500=0
We move all terms containing x to the left, all other terms to the right
1.2x=500
x=500/1.2
x=416+0.80000000000001/1.2
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