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19.99+0.85x=218.89
We move all terms to the left:
19.99+0.85x-(218.89)=0
We add all the numbers together, and all the variables
0.85x-198.9=0
We move all terms containing x to the left, all other terms to the right
0.85x=198.9
x=198.9/0.85
x=234
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