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= 2x - 4x + 3y - 5y
= -2x - 2y
2). (9x² + 7x²) (- 8x² - 5x²)
= 16x² - 13x²
= 3x²
3). 7a(1+b) - 3b(1+a)
= 7a + 7ab - 3b - 3ab
= 7a + 7ab - 3ab - 3b
= 7a + 4ab - 3b
untk soal yg menggunakan tanda kutip (") dan tanda garis miring (/) itu mksud ny apa yaa?? :)
2.18-6x"
3.7a+7ab-3b-3ab
maaf kalo salah