0.4x+x=40

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Solution for 0.4x+x=40 equation: 



0.4x+x=40

We move all terms to the left:

0.4x+x-(40)=0

We add all the numbers together, and all the variables

1.4x-40=0

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

1.4x=40

x=40/1.4

x=28+0.8/1.4

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