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а) 3с + 7с - 8с =
б) 16а - 5а + 7а - 11а =
в) -4t + 3t - 8 - 7t =
г) 8х - 8у + 2у - 6х =
д) 4,5 - 7b + 1,5а + 1 =
е) -а + 3b - 4b + 1,5а =
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