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5.4x-1.7=19.9
We move all terms to the left:
5.4x-1.7-(19.9)=0
We add all the numbers together, and all the variables
5.4x-21.6=0
We move all terms containing x to the left, all other terms to the right
5.4x=21.6
x=21.6/5.4
x=4
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