7x+30=9x+42=104

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Solution for 7x+30=9x+42=104 equation: 



7x+30=9x+42=104

We move all terms to the left:

7x+30-(9x+42)=0

We get rid of parentheses

7x-9x-42+30=0

We add all the numbers together, and all the variables

-2x-12=0

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

-2x=12

x=12/-2

x=-6

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