persamaan x - 1 per 2 + x per 3 = 3 x + 1 per 5

(x-1)/2 + x/3 = (3x+1)/5 kalikan 30
(x-1)30/2 + x(30)/3 = (3x+1)30/5
(x - 1)15 + x(10) = (3x + 1)(6)
15x - 15 + 10x = 18x + 6
25x - 18x = 15 + 6
7x = 21
x = 21/7 = 3