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5-(2-a+4+9) = 0
5-2 +a-4-9 = 0
a = -5+2 +4 +9
a = 10
8. 100-5p = 4p + 10(2p-6)
100-5p = 8p² + 20p-24p-60
160-5p = 8p²-4p
160 = 8p² + p