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13(x+3)=78x
We move all terms to the left:
13(x+3)-(78x)=0
We add all the numbers together, and all the variables
-78x+13(x+3)=0
We multiply parentheses
-78x+13x+39=0
We add all the numbers together, and all the variables
-65x+39=0
We move all terms containing x to the left, all other terms to the right
-65x=-39
x=-39/-65
x=3/5
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