Помогите решить уравнения: 1) 4•(2х-3)+5=5х-1
2) -1 2/3•(-3/5у+2/3)=2 5/9-2у
3) 2•(3х-1)+9=5-7х
4) 3/4•(5/6-2/3х)=5х-4 1/2
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