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2x+0.6x-6.6=0.4
We move all terms to the left:
2x+0.6x-6.6-(0.4)=0
We add all the numbers together, and all the variables
2.6x-7=0
We move all terms containing x to the left, all other terms to the right
2.6x=7
x=7/2.6
x=2+1/1.4444444444444
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