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0.9x-(0.9x*0.2)=100
We move all terms to the left:
0.9x-(0.9x*0.2)-(100)=0
We add all the numbers together, and all the variables
0.9x-(+0.9x*0.2)-100=0
We get rid of parentheses
0.9x-0.9x*0.2-100=0
We move all terms containing x to the left, all other terms to the right
0.9x-0.9x*0.2=100
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