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2. 3p² dan -5p²
3. 6ab + 3bc + 4c = 3b ( 2a + c ) + 4c
2ab + 4bc - 4c = 2 ( ab + 2bc - 2c )
= 2 ( 2b ( a + c ) - 2c )
2. 3p² dan -5p²
3. 3b(2a + c) + 4c
2(ab + 2bc - 2c) = 2[2b(a + c) - 2c]