Решите уравнения  a)5x=3,15               ж)18х=4,2+4х
б)23х=22,747          з)33х=56-7х
в)3х=0,0087           и)19х+36=37
г)9х-3х=10,2
д)3х+17х=165
е)2х+2х=6
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