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8.9x-13.8=21.8
We move all terms to the left:
8.9x-13.8-(21.8)=0
We add all the numbers together, and all the variables
8.9x-35.6=0
We move all terms containing x to the left, all other terms to the right
8.9x=35.6
x=35.6/8.9
x=4
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