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200+x(0.15)=285.50
We move all terms to the left:
200+x(0.15)-(285.50)=0
We add all the numbers together, and all the variables
x(0.15)+200-(285.5)=0
We add all the numbers together, and all the variables
x(0.15)-85.5=0
We multiply parentheses
0.15x-85.5=0
We move all terms containing x to the left, all other terms to the right
0.15x=85.5
x=85.5/0.15
x=570
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