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=Class A:= [First post here}

=Class C:=

5.
== 5 = (10 - 5) / (7 - k) 5 = 5 / (7 - k) 5 (7 - k) = 5 35 - 5k = 5 30 = 5k 6 = k Therefore k = 6.

Check: LS RS 5 (10-5) / (7-6) 5 / 1 5 Therefore LS=RS.