18+19=12-20+x

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Solution for 18+19=12-20+x equation: 



18+19=12-20+x

We move all terms to the left:

18+19-(12-20+x)=0

We add all the numbers together, and all the variables

-(x-8)+18+19=0

We add all the numbers together, and all the variables

-(x-8)+37=0

We get rid of parentheses

-x+8+37=0

We add all the numbers together, and all the variables

-1x+45=0

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

-x=-45

x=-45/-1

x=+45

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