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8.7x-2.9=75.4
We move all terms to the left:
8.7x-2.9-(75.4)=0
We add all the numbers together, and all the variables
8.7x-78.3=0
We move all terms containing x to the left, all other terms to the right
8.7x=78.3
x=78.3/8.7
x=9
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