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x+y = 80
(x-10) = 2(y-10)
x+y = 80
2y-x = 10
________ +
3y = 90 → y = 30
Substitusi nilai y ke salah satu persamaan
x+y = 80
x+30 = 80
x = 80-30 = 50
Jadi encep = 50rb dan jajang = 30rb
Cuma itu doang, yg nomer 2 gatau. Semoga bermanfaat