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x-0.1x-0.2x=500
We move all terms to the left:
x-0.1x-0.2x-(500)=0
We add all the numbers together, and all the variables
0.7x-500=0
We move all terms containing x to the left, all other terms to the right
0.7x=500
x=500/0.7
x=714+0.20000000000005/0.7
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