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2.5x-1.6=6.9
We move all terms to the left:
2.5x-1.6-(6.9)=0
We add all the numbers together, and all the variables
2.5x-8.5=0
We move all terms containing x to the left, all other terms to the right
2.5x=8.5
x=8.5/2.5
x=3+1/2.5
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