21=0.4x-0-9x-4

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Solution for 21=0.4x-0-9x-4 equation: 



21=0.4x-0-9x-4

We move all terms to the left:

21-(0.4x-0-9x-4)=0

We add all the numbers together, and all the variables

-(-8.6x-4)+21=0

We get rid of parentheses

8.6x+4+21=0

We add all the numbers together, and all the variables

8.6x+25=0

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

8.6x=-25

x=-25/8.6

x=-2+4.3333333333333/4.7777777777778

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