72=x+84

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Solution for 72=x+84 equation: 



72=x+84

We move all terms to the left:

72-(x+84)=0

We get rid of parentheses

-x-84+72=0

We add all the numbers together, and all the variables

-1x-12=0

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

-x=12

x=12/-1

x=-12

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