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x-0.2x=105
We move all terms to the left:
x-0.2x-(105)=0
We add all the numbers together, and all the variables
0.8x-105=0
We move all terms containing x to the left, all other terms to the right
0.8x=105
x=105/0.8
x=131+0.19999999999999/0.8
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