Ответы на вопрос:
(4-c) +2(c-3)= -13 4 - c + 2c - 6 = - 13 c = - 13 - 4 + 6 = - 11 c = - 11 11+2x=55+3x 2x - 3x = 55 - 11 - x = 44 -15-3x=-7x+45 - 3x + 7x = 45 + 15 4x = 60 x = 60/4 = 15
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