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x-0.15x=20.40
We move all terms to the left:
x-0.15x-(20.40)=0
We add all the numbers together, and all the variables
x-0.15x-(20.4)=0
We add all the numbers together, and all the variables
0.85x-20.4=0
We move all terms containing x to the left, all other terms to the right
0.85x=20.4
x=20.4/0.85
x=24
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