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= 6a +12b +21 a + 28b
= 27 a+ 40 b
2. 9 (5x +3y) - 4(7x-6y)
= 45 x + 27 b - 28 x + 24 y
= 17x+ 51 y
= 27a + 40b
2) 9(5x +3y) - 4(7x -6y) = 45x + 27y - 28x + 24y
= 17x + 51y
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