45=18+20+x

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Solution for 45=18+20+x equation: 



45=18+20+x

We move all terms to the left:

45-(18+20+x)=0

We add all the numbers together, and all the variables

-(x+38)+45=0

We get rid of parentheses

-x-38+45=0

We add all the numbers together, and all the variables

-1x+7=0

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

-x=-7

x=-7/-1

x=+7

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