84=3x+4x+7

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Solution for 84=3x+4x+7 equation: 



84=3x+4x+7

We move all terms to the left:

84-(3x+4x+7)=0

We add all the numbers together, and all the variables

-(7x+7)+84=0

We get rid of parentheses

-7x-7+84=0

We add all the numbers together, and all the variables

-7x+77=0

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

-7x=-77

x=-77/-7

x=+11

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