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8.1x+9=5.1x.3
We move all terms to the left:
8.1x+9-(5.1x.3)=0
We add all the numbers together, and all the variables
8.1x-(+5.1x.3)+9=0
We get rid of parentheses
8.1x-5.1x.3+9=0
We move all terms containing x to the left, all other terms to the right
8.1x-5.1x.3=-9
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