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5+7(x+1)=12+10x
5+7x+7=12+10x
12+7x=12+10x
12=12+10x-7x
12=12-3x
0=3x
0=x

The answer is 0, What if i leave it as 3, would that be wrong?

oh yes, absolutely! it's zero, that's very different from 3!

How did you get O or 3 bye itself

0=3x, so then divide both sides by 3. you get 0=x