4x + 8 + 6y + 12 + 5y + 3 + 6x - 28 = 360
10x + 11y + -5 = 360
10x + 11y = 365
Substituting the possible solutions
10(20) + 11y = 365
200 + 11y = 365
11y = 365 - 200
11y = 165
y = 165/11
y = 15
So, after doing this procedure for all the possible solutions, the only with a whole number as a result is the number 20.
So, the result is 20.