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4x-1.9=x-4.0
We move all terms to the left:
4x-1.9-(x-4.0)=0
We add all the numbers together, and all the variables
4x-(x-4)-1.9=0
We get rid of parentheses
4x-x+4-1.9=0
We add all the numbers together, and all the variables
3x+2.1=0
We move all terms containing x to the left, all other terms to the right
3x=-2.1
x=-2.1/3
x=-2.1/3
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