21=6-0.4x

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Solution for 21=6-0.4x equation: 



21=6-0.4x

We move all terms to the left:

21-(6-0.4x)=0

We add all the numbers together, and all the variables

-(-0.4x+6)+21=0

We get rid of parentheses

0.4x-6+21=0

We add all the numbers together, and all the variables

0.4x+15=0

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

0.4x=-15

x=-15/0.4

x=-37+0.2/0.4

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