0.7x=0.4x+3.9

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Solution for 0.7x=0.4x+3.9 equation: 



0.7x=0.4x+3.9

We move all terms to the left:

0.7x-(0.4x+3.9)=0

We get rid of parentheses

0.7x-0.4x-3.9=0

We add all the numbers together, and all the variables

0.3x-3.9=0

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

0.3x=3.9

x=3.9/0.3

x=13

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