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x-x(0.10)=380
We move all terms to the left:
x-x(0.10)-(380)=0
We add all the numbers together, and all the variables
x-x(0.1)-380=0
We multiply parentheses
x-0.1x-380=0
We add all the numbers together, and all the variables
0.9x-380=0
We move all terms containing x to the left, all other terms to the right
0.9x=380
x=380/0.9
x=422+0.19999999999999/0.9
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