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39+39=8x+12
We move all terms to the left:
39+39-(8x+12)=0
We add all the numbers together, and all the variables
-(8x+12)+78=0
We get rid of parentheses
-8x-12+78=0
We add all the numbers together, and all the variables
-8x+66=0
We move all terms containing x to the left, all other terms to the right
-8x=-66
x=-66/-8
x=8+1/4
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