20-0.4x=9

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Solution for 20-0.4x=9 equation: 



20-0.4x=9

We move all terms to the left:

20-0.4x-(9)=0

We add all the numbers together, and all the variables

-0.4x+11=0

We move all terms containing x to the left, all other terms to the right

-0.4x=-11

x=-11/-0.4

x=27+0.2/0.4

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