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4.20x=5.1
We move all terms to the left:
4.20x-(5.1)=0
We add all the numbers together, and all the variables
4.20x-5.1=0
We move all terms containing x to the left, all other terms to the right
4.20x=5.1
x=5.1/4.20
x=1+0.9/4.20
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