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x+x(0.35)=6600
We move all terms to the left:
x+x(0.35)-(6600)=0
We multiply parentheses
x+0.35x-6600=0
We add all the numbers together, and all the variables
1.35x-6600=0
We move all terms containing x to the left, all other terms to the right
1.35x=6600
x=6600/1.35
x=4888+1/1.1250000000002
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