X*0.40=x-12

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Solution for X*0.40=x-12 equation: 



X*0.40=X-12

We move all terms to the left:

X*0.40-(X-12)=0

Wy multiply elements

0.4X-(X-12)=0

We get rid of parentheses

0.4X-X+12=0

We add all the numbers together, and all the variables

-0.6X+12=0

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

-0.6X=-12

X=-12/-0.6

X=+20

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