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2x+3.8x=0.45
We move all terms to the left:
2x+3.8x-(0.45)=0
We add all the numbers together, and all the variables
5.8x-0.45=0
We move all terms containing x to the left, all other terms to the right
5.8x=0.45
x=0.45/5.8
x=0.45/5.8
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