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0.4x+6.1x=10
We move all terms to the left:
0.4x+6.1x-(10)=0
We add all the numbers together, and all the variables
6.5x-10=0
We move all terms containing x to the left, all other terms to the right
6.5x=10
x=10/6.5
x=1+1/1.8571428571429
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