Divide 25 into two parts such that 7 times the first part added to 5 times the second part makes 139

Let one part be x.
The other part = (25 - x)
Sum = 7x + 5(25 - x) = 139
=> 7x + 125 - 5x = 139
=> 2x = 139 - 125 = 14
=> x = 7
=> 25 - x = 25 - 7 = 18.
Hence, the divisions are 7 and 18.