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x-0.1x=315.99
We move all terms to the left:
x-0.1x-(315.99)=0
We add all the numbers together, and all the variables
0.9x-315.99=0
We move all terms containing x to the left, all other terms to the right
0.9x=315.99
x=315.99/0.9
x=351+0.089999999999975/0.9
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