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x(.1)=300
We move all terms to the left:
x(.1)-(300)=0
We add all the numbers together, and all the variables
x(0.1)-300=0
We multiply parentheses
0.1x-300=0
We move all terms containing x to the left, all other terms to the right
0.1x=300
x=300/0.1
x=3000
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