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2.4x-12=8.4x+42
We move all terms to the left:
2.4x-12-(8.4x+42)=0
We get rid of parentheses
2.4x-8.4x-42-12=0
We add all the numbers together, and all the variables
-6x-54=0
We move all terms containing x to the left, all other terms to the right
-6x=54
x=54/-6
x=-9
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