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2.5x-x+3.8x+0.7x=0.54
We move all terms to the left:
2.5x-x+3.8x+0.7x-(0.54)=0
We add all the numbers together, and all the variables
6x-0.54=0
We move all terms containing x to the left, all other terms to the right
6x=0.54
x=0.54/6
x=0.54/6
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