2w-5t=56 dan w-6t=-24

2w-5t = 56 ......(1)
w-6t   = -24......(2)
kalikan 2 persamaan (2)
2w-12t = -48

2w-5t = 56
2w-12t=-48
----------------- -
        7t = 104
          t = 104/7
2w-5t = 56
2w-520/7=56
2w=56+520/7
2w=392+520/7
2w=912/7
  w=912/14 selesai