x*0.4+x=12

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Solution for x*0.4+x=12 equation: 



x*0.4+x=12

We move all terms to the left:

x*0.4+x-(12)=0

We add all the numbers together, and all the variables

x+x*0.4-12=0

Wy multiply elements

x+0.4x-12=0

We add all the numbers together, and all the variables

1.4x-12=0

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

1.4x=12

x=12/1.4

x=8+0.8/1.4

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