holly-rogers_60a5de8a38952
holly-rogers_60a5de8a38952
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5a-3b=130 a+b=50(*3) 5a-3b=130 3a+3b=150 8a=280 a = 35 a+b=50 35+b=50 b=15 acertou 35 questões e errou 15