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6+78x=39+42
We move all terms to the left:
6+78x-(39+42)=0
We add all the numbers together, and all the variables
78x+6-81=0
We add all the numbers together, and all the variables
78x-75=0
We move all terms containing x to the left, all other terms to the right
78x=75
x=75/78
x=25/26
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