Give reasons:If x+y=7,then x+y+z=7+z
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x+y+z=x+y ka man rakhge
7+z
7+z
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if x+y=7
then substituting the value of (x+y) in
x+y+z= 7+ z
therefore
7+z= 7+z
then substituting the value of (x+y) in
x+y+z= 7+ z
therefore
7+z= 7+z
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