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11.5+x+.05(11.5+x)=16.80
We move all terms to the left:
11.5+x+.05(11.5+x)-(16.80)=0
We add all the numbers together, and all the variables
x+.05(x+11.5)+11.5-(16.8)=0
We add all the numbers together, and all the variables
x+.05(x+11.5)-5.3=0
We multiply parentheses
x+0.05x+0.575-5.3=0
We add all the numbers together, and all the variables
1.05x-4.725=0
We move all terms containing x to the left, all other terms to the right
1.05x=4.725
x=4.725/1.05
x=4+0.525/1.05
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