Since the question is 3(2a), then just write it out. 3(2a) is 2a+2a+2a or 6a.
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2a*3 = 8+4a 6a = 8+4a 6a-4a = 8 2a = 8 a = 4
2a -3 means 2 times a minus 3 if a = 2 we have 2 x 2 - 3 = 4 - 3 = 1
(6ab + 9b)/(2a + 3) = 3b(2a + 3)/(2a + 3) = 3b
(6a3 - 19a2 + 15a)/(2a - 3) = a(6a2 - 19a + 15)/(2a - 3) = a(2a - 3)(3a -5)/(2a -3) = a(3a - 5)
9a +8 -2a -3 -5a = 2a +5