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x-0.10x=280
We move all terms to the left:
x-0.10x-(280)=0
We add all the numbers together, and all the variables
0.9x-280=0
We move all terms containing x to the left, all other terms to the right
0.9x=280
x=280/0.9
x=311+0.099999999999966/0.9
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