Ответы на вопрос:
(1) 3b+(5-7b) = 3b+5-7b = 5-4b (2) -(8c-4)-4 = -8c+4-4 = -8c (3) 3(8a-4)+6a = 24a-12+6a = 30a-12 (4) 7p-2(3p-1) = 7p-6p+2 = p+2 (5) x-(x-(2x-4)) = x-(x-2x+4) = +4) = x+x-4 = 2x-4
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