12+10+3=x

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Solution for 12+10+3=x equation: 



12+10+3=x

We move all terms to the left:

12+10+3-(x)=0

We add all the numbers together, and all the variables

-1x+25=0

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

-x=-25

x=-25/-1

x=+25

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