77=x+3x+7x

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Solution for 77=x+3x+7x equation: 



77=x+3x+7x

We move all terms to the left:

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

We add all the numbers together, and all the variables

-(+11x)+77=0

We get rid of parentheses

-11x+77=0

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

-11x=-77

x=-77/-11

x=+7

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