-0.4x+3=7

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Solution for -0.4x+3=7 equation: 



-0.4x+3=7

We move all terms to the left:

-0.4x+3-(7)=0

We add all the numbers together, and all the variables

-0.4x-4=0

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

-0.4x=4

x=4/-0.4

x=-10

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