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2a² + 15a - 8 = 2a² + 9a
15a - 8 = 9a
6a = 8
a = 4/3
2a²+16a-1a-8=2a²+9a
2a²-2a²+15a-9a=8
6a = 8
a= 8/6
a=4/3