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.3X+1.5X=431
We move all terms to the left:
.3X+1.5X-(431)=0
We add all the numbers together, and all the variables
1.8X-431=0
We move all terms containing X to the left, all other terms to the right
1.8X=431
X=431/1.8
X=239+0.80000000000001/1.8
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