21=0.4-0.9x-4

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Solution for 21=0.4-0.9x-4 equation: 



21=0.4-0.9x-4

We move all terms to the left:

21-(0.4-0.9x-4)=0

We add all the numbers together, and all the variables

-(-0.9x-3.6)+21=0

We get rid of parentheses

0.9x+3.6+21=0

We add all the numbers together, and all the variables

0.9x+24.6=0

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

0.9x=-24.6

x=-24.6/0.9

x=-27+0.3/0.9

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