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x+x+0.8x=499
We move all terms to the left:
x+x+0.8x-(499)=0
We add all the numbers together, and all the variables
2.8x-499=0
We move all terms containing x to the left, all other terms to the right
2.8x=499
x=499/2.8
x=178+0.60000000000002/2.8
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