155=77-x

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Solution for 155=77-x equation: 



155=77-x

We move all terms to the left:

155-(77-x)=0

We add all the numbers together, and all the variables

-(-1x+77)+155=0

We get rid of parentheses

1x-77+155=0

We add all the numbers together, and all the variables

x+78=0

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

x=-78

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