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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