Find the value of λ , if x = −λ and y = 5/2 is a solution of the equation x + 4y – 7 = 0.
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x+4y-7=0
-^+4×5/2-7=0
-^+10-7=0
-^+3=0
-^=-3
^=3
-^+4×5/2-7=0
-^+10-7=0
-^+3=0
-^=-3
^=3
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