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0.6X+3X=15
We move all terms to the left:
0.6X+3X-(15)=0
We add all the numbers together, and all the variables
3.6X-15=0
We move all terms containing X to the left, all other terms to the right
3.6X=15
X=15/3.6
X=4+0.6/3.6
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