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4.2x-9=2.4
We move all terms to the left:
4.2x-9-(2.4)=0
We add all the numbers together, and all the variables
4.2x-11.4=0
We move all terms containing x to the left, all other terms to the right
4.2x=11.4
x=11.4/4.2
x=2+3/4.2
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