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8300.9(x-20)=
We move all terms to the left:
8300.9(x-20)-()=0
We add all the numbers together, and all the variables
8300.9(x-20)=0
We multiply parentheses
8300.9x-166018=0
We move all terms containing x to the left, all other terms to the right
8300.9x=166018
x=166018/8300.9
x=20
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