Solution
$$2x + 5y = 109$$ ---------------Eqn(1)
$$2x + 5 = y + 12$$
=> $$2x - y = 7$$ ----------------Eqn(2)
Subtracting eqn(2) from eqn(1), we get :
=> $$6y = 102$$
=> $$y = 17$$ and $$x = 12$$
$$\therefore$$ $$y - x = 17 - 12 = 5$$
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