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0.9(x+20)=830
We move all terms to the left:
0.9(x+20)-(830)=0
We multiply parentheses
0.9x+18-830=0
We add all the numbers together, and all the variables
0.9x-812=0
We move all terms containing x to the left, all other terms to the right
0.9x=812
x=812/0.9
x=902+0.19999999999993/0.9
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