0.4x+0.4=0.9x-2.1

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Solution for 0.4x+0.4=0.9x-2.1 equation: 



0.4x+0.4=0.9x-2.1

We move all terms to the left:

0.4x+0.4-(0.9x-2.1)=0

We get rid of parentheses

0.4x-0.9x+2.1+0.4=0

We add all the numbers together, and all the variables

-0.5x+2.5=0

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

-0.5x=-2.5

x=-2.5/-0.5

x=+5

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