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0.8x+0.8*100+0.2x=105
We move all terms to the left:
0.8x+0.8*100+0.2x-(105)=0
determiningTheFunctionDomain 0.8x+0.2x-105+0.8*100=0
We add all the numbers together, and all the variables
x-25=0
We move all terms containing x to the left, all other terms to the right
x=25
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