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3.89x=-5.11x+5.4
We move all terms to the left:
3.89x-(-5.11x+5.4)=0
We get rid of parentheses
3.89x+5.11x-5.4=0
We add all the numbers together, and all the variables
9x-5.4=0
We move all terms containing x to the left, all other terms to the right
9x=5.4
x=5.4/9
x=3.85714285714/6.42857142857
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