a+(a-12)=238

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Solution for a+(a-12)=238 equation: 



a+(a-12)=238

We move all terms to the left:

a+(a-12)-(238)=0

We get rid of parentheses

a+a-12-238=0

We add all the numbers together, and all the variables

2a-250=0

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

2a=250

a=250/2

a=125

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