3x+7=9x-77=90

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Solution for 3x+7=9x-77=90 equation: 



3x+7=9x-77=90

We move all terms to the left:

3x+7-(9x-77)=0

We get rid of parentheses

3x-9x+77+7=0

We add all the numbers together, and all the variables

-6x+84=0

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

-6x=-84

x=-84/-6

x=+14

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