Answer:
x=6
Explanation:
expanding we get
13x-39=39
13x=39+39
13x=78
x=78/13
13(x-3)=39
Divide each side by 13
13/13(x-3)=39/13
x-3 = 3
Add 3 to each side
x-3+3 = 3+3
x = 6
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