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Q.If the system of equations x+4y-z=λ, 7x+9y+μz=-3, 5x+y+2z=-1 has infinitely many solutions,then (2μ+3λ) is equal to∶ (JEE Main 08 Apr 2024 Shift 2) (1) 3 (2)-3 (3)-2 (4) 2