90=42+x

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Solution for 90=42+x equation: 



90=42+x

We move all terms to the left:

90-(42+x)=0

We add all the numbers together, and all the variables

-(x+42)+90=0

We get rid of parentheses

-x-42+90=0

We add all the numbers together, and all the variables

-1x+48=0

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

-x=-48

x=-48/-1

x=+48

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