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Verified answer
Y = 2x + 5 ⇒ y - 2x = 5 (×2) 2y - 4x = 10y = -4x - 1 ⇒ y + 4x = -1 (×1) y + 4x = -1
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3y = 9
y = 3
y + 4x = -1
3 + 4x = -1
4x = -1 -3
4x = -4
x = (-4) / 4
x = -1