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5X+4X=17.4
We move all terms to the left:
5X+4X-(17.4)=0
We add all the numbers together, and all the variables
9X-17.4=0
We move all terms containing X to the left, all other terms to the right
9X=17.4
X=17.4/9
X=1+6/6.42857142857
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