4x+40=12x

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Solution for 4x+40=12x equation: 



4x+40=12x

We move all terms to the left:

4x+40-(12x)=0

We add all the numbers together, and all the variables

-8x+40=0

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

-8x=-40

x=-40/-8

x=+5

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