exam Maths Puzzle Numerical Ability

4x-(x+14)=4x+3

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Please help me with this problem to!
Find the area of a triangle if side b = 5, side c = 4, and angle A = 20 degrees.
Thanks so much, Ray Factor.3a^2(a-b)-6a(a-b)+21(a-b)

Please assist me with the proper way to do this problem.

Possible answers: A: (3a � b)(a^2 � 2a + 7), B:3(a � b)(a^2 � 6a + 21),
C:(a � b)(3a^2 � 6a + 21)D:3(a � b)(a^2 � 2a + 7).

Thanks