7x-9=-4x=90

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



7x-9=-4x=90

We move all terms to the left:

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

We get rid of parentheses

7x+4x-9=0

We add all the numbers together, and all the variables

11x-9=0

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

11x=9

x=9/11

x=9/11

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