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4x+6.4=2x-6
We move all terms to the left:
4x+6.4-(2x-6)=0
We get rid of parentheses
4x-2x+6+6.4=0
We add all the numbers together, and all the variables
2x+12.4=0
We move all terms containing x to the left, all other terms to the right
2x=-12.4
x=-12.4/2
x=-6+0.4/2
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