а) 3а + 5 = 8а – 15
б) 4,72 – 2,5х = 2х + 2,92
в) 6х – 4 = 20
г) 4х + 18 = 2х
д) 20 – 5х = 8х – 6
е) 4,37 + 6,7х = 7,75 + 9,3х
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