-15=0.4x-0.9x

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Solution for -15=0.4x-0.9x equation: 



-15=0.4x-0.9x

We move all terms to the left:

-15-(0.4x-0.9x)=0

We add all the numbers together, and all the variables

-(-0.5x)-15=0

We get rid of parentheses

0.5x-15=0

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

0.5x=15

x=15/0.5

x=30

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