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2.5x-4.2=1.5x+1.8
We move all terms to the left:
2.5x-4.2-(1.5x+1.8)=0
We get rid of parentheses
2.5x-1.5x-1.8-4.2=0
We add all the numbers together, and all the variables
x-6=0
We move all terms containing x to the left, all other terms to the right
x=6
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