if ( c - a ) / ( c - b ) = 1 , then ( 5 b - 3 a ) / ( c - a ) =
"let ' s say c = 2 , b = 1 , a = 1 so that our 1 st expression holds true . now , ibsert those numbers in the second expression and we ' ll get 2 answer d ( hopefully ) ) )"
multiply(subtract(5, 3), 3)