It is 37.
2x-5 is twice a number decreased by 5.
37/5 : 6*37/6 = 37/5 : 37 = 1/5 : 1 = 1 : 5
1
37 - 5 - 19 = 13.
37/5 = 72/5.
Decreased means subtract. If your age is decreased by 5, that means take your age and subtract 5.
It is: 5*37 = 185
37
80 - 5% = 76
37
37-42 = -5