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78=9x+12
We move all terms to the left:
78-(9x+12)=0
We get rid of parentheses
-9x-12+78=0
We add all the numbers together, and all the variables
-9x+66=0
We move all terms containing x to the left, all other terms to the right
-9x=-66
x=-66/-9
x=7+1/3
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