(2A/A)+6 is equal to eight. 2A/A leaves one with 2, since the As cancel out and 2 and 6 is eight.
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6(2a plus b)
If I've read your question correctly, you need to subtract: a2 +2a -7 a2 -4a2 +5a2 -6 = 2a2 -6 Note, if x - y = z, then y = x - z; so: 2a2 -6 - (a2 -2a +1) = 2a2 -6 - a2 +2a -1 = a2 +2a -7
2a + a = 3a
2(a + 7)(a - 6)
(6ab + 9b)/(2a + 3) = 3b(2a + 3)/(2a + 3) = 3b