7x=9x-40

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Solution for 7x=9x-40 equation: 



7x=9x-40

We move all terms to the left:

7x-(9x-40)=0

We get rid of parentheses

7x-9x+40=0

We add all the numbers together, and all the variables

-2x+40=0

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

-2x=-40

x=-40/-2

x=+20

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