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An+An-1
d= (2a+7)-(5a+2)
d= 2a +7 - 5a - 2
d = -3a +5
d= (3a-7)-(2a+7)
d= 3a - 7 - 2a - 7
d= a - 14
d = d
-3a +5 = a - 14
14 + 5 = a + 3a
19 = 4a
a = 19/4