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3(8+a) + 7(6+4a) = 24 + 3a + 42 + 28a
= 3a + 28a + 24 + 42
= 31a + 66
nomor 2
3(x+y) + 4(2x+3y) = 3x + 3y + 8x + 12y
= 3x + 8x + 3y + 12y
= 11x + 15y
= 24 + 3a + 42 + 28a
= 24 + 42 + 3a + 28a
= 66 + 31a
2. 3(x+y) + 4(2x+3y)
= 3x + 3y + 8x + 12y
= 3x + 8x + 3y + 12y
= 11x + 15y