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.4x-9+1.5x=8
We move all terms to the left:
.4x-9+1.5x-(8)=0
We add all the numbers together, and all the variables
1.9x-17=0
We move all terms containing x to the left, all other terms to the right
1.9x=17
x=17/1.9
x=8+1/1.0555555555556
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