4x=40+9x

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Solution for 4x=40+9x equation: 



4x=40+9x

We move all terms to the left:

4x-(40+9x)=0

We add all the numbers together, and all the variables

4x-(9x+40)=0

We get rid of parentheses

4x-9x-40=0

We add all the numbers together, and all the variables

-5x-40=0

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

-5x=40

x=40/-5

x=-8

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