78=x+42

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Solution for 78=x+42 equation: 



78=x+42

We move all terms to the left:

78-(x+42)=0

We get rid of parentheses

-x-42+78=0

We add all the numbers together, and all the variables

-1x+36=0

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

-x=-36

x=-36/-1

x=+36

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