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5.9x-12=3.9x
We move all terms to the left:
5.9x-12-(3.9x)=0
We add all the numbers together, and all the variables
5.9x-(+3.9x)-12=0
We get rid of parentheses
5.9x-3.9x-12=0
We add all the numbers together, and all the variables
2x-12=0
We move all terms containing x to the left, all other terms to the right
2x=12
x=12/2
x=6
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