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7+78x=39+13
We move all terms to the left:
7+78x-(39+13)=0
We add all the numbers together, and all the variables
78x+7-52=0
We add all the numbers together, and all the variables
78x-45=0
We move all terms containing x to the left, all other terms to the right
78x=45
x=45/78
x=15/26
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