90=x+72

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Solution for 90=x+72 equation: 



90=x+72

We move all terms to the left:

90-(x+72)=0

We get rid of parentheses

-x-72+90=0

We add all the numbers together, and all the variables

-1x+18=0

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

-x=-18

x=-18/-1

x=+18

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