7x-4=9x-40=90

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Solution for 7x-4=9x-40=90 equation: 



7x-4=9x-40=90

We move all terms to the left:

7x-4-(9x-40)=0

We get rid of parentheses

7x-9x+40-4=0

We add all the numbers together, and all the variables

-2x+36=0

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

-2x=-36

x=-36/-2

x=+18

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