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5x=x-2.1
We move all terms to the left:
5x-(x-2.1)=0
We get rid of parentheses
5x-x+2.1=0
We add all the numbers together, and all the variables
4x+2.1=0
We move all terms containing x to the left, all other terms to the right
4x=-2.1
x=-2.1/4
x=-1/1.9047619047619
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