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3a + 7b - (5a - 8b)
3a + 7b - 5a + 8b
-2a + 15b
b. -3x (2x+5y) dari 4x(3x-2y)
-6x² - 15xy + 12x² - 8xy
12 x² - 6xy - (-6x² - 8xy)
12 x² - 6xy + 6x² + 8xy
18 x² + 2xy