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5 - 5 = 9a - 6a - a
0 = 3a - a
0 = 2a
0 = a
6a + a + 5 = 9a + 5
7a + 5 = 9a + 5
7a - 9a = +5 - 5
2a = 0
2a / 2 = 0/2
a = 0