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4.2x=1.8
We move all terms to the left:
4.2x-(1.8)=0
We add all the numbers together, and all the variables
4.2x-1.8=0
We move all terms containing x to the left, all other terms to the right
4.2x=1.8
x=1.8/4.2
x=1/2.3333333333333
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