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= 7 + 37 < 3a + 8a
= 44 < 11a
= a > 4
jadi nilai a > 4, x€R
jawabannya C
12) 2/3(x-12) = 4x/5 - 6
=> 2x/3 - 8 = 4x/5 -6
=> 2x/3-4x/5 = -6 + 8
=> 10x-12x/15 = 2
=> -2x= 30
=> x = -15
jawabannya A