= (8a²-a+18) + (17a²+2a-19)
= 8a²+17a²-a+2a+18-19
= 25a²+a-1
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= (8a²-a+18) + (17a²+2a-19)
= 8a²+17a²-a+2a+18-19
= 25a²+a-1