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3x-42.15=3.45
We move all terms to the left:
3x-42.15-(3.45)=0
We add all the numbers together, and all the variables
3x-45.6=0
We move all terms containing x to the left, all other terms to the right
3x=45.6
x=45.6/3
x=15+0.6/3
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