if p( -1, 1) is the midpoint of the line segment joining a(-3,b) and b(1,b+4) then find b

if p( -1, 1) is the midpoint of the line segment joining a(-3,b) and b

1.	if p( -1, 1) is the midpoint of the line segment joining a(-3,b) and b(1,b+4) then find b
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