Ответ:
6(а+7,5)-5(а+13,2) = 6a + 45 - 5a - 66 = a-21
a = 1.5
1.5 - 21 = -19.5
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Ответ:
6(а+7,5)-5(а+13,2) = 6a + 45 - 5a - 66 = a-21
a = 1.5
1.5 - 21 = -19.5