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= 7x^2-7xy +14x - 5x^2 + 10 xy + 5x
= 7x^2 - 5x^2 +10 xy-7xy + 14x + 5x
= 2x^2 + 3xy + 19x
Jawabannya : A. 2x^2 + 3xy + 19x
= ( - 7xy + 14x ) - ( - 10xy - 5x)
7x^2 - 7xy + 14x - 5x^2 + 10xy + 5x
2x^2 + 3xy + 19x (A)