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7.8x-5.9=17.5
We move all terms to the left:
7.8x-5.9-(17.5)=0
We add all the numbers together, and all the variables
7.8x-23.4=0
We move all terms containing x to the left, all other terms to the right
7.8x=23.4
x=23.4/7.8
x=3
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