12=4+0.8x

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Solution for 12=4+0.8x equation: 



12=4+0.8x

We move all terms to the left:

12-(4+0.8x)=0

We add all the numbers together, and all the variables

-(0.8x+4)+12=0

We get rid of parentheses

-0.8x-4+12=0

We add all the numbers together, and all the variables

-0.8x+8=0

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

-0.8x=-8

x=-8/-0.8

x=+10

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