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.9(x-20)=830
We move all terms to the left:
.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-848=0
We move all terms containing x to the left, all other terms to the right
0.9x=848
x=848/0.9
x=942+0.2/0.9
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