помогите. Решить уравнение:
а) 21 + 2х = 56; б) у – 89 = 90.
в) 7у – 39 = 717; г) х + 3х = 76.
д)12 + 8,3х + 1,5х = 95,3
е) 6,7у + 13 + 3,1у = 86,5.
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