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x + 2y = -5
Substitusi x = 3y + 10 ke persamaan x + 2y = -5
3y + 10 + 2y = -5
5y + 10 = -5
5y = -15
y = -3
Substitusi y = -3 ke x + 2y = -5
x + 2(-3) = -5
x - 6 = -5
x = 1
Maka x = 1 dan y = -3