упростите выражение:1) 5/8х -(1/4х-1/12у)+1/3у2)9,4х+(2х-11 3/4у)-3 5/9у3)2 1/6х-(7х-1

1) /х -(/х-/у)+/у=/х - /х + /у +/у= /x + /y
/х - /х = /х - /х =/х - /х = /x = /x  
/у +/у=/у +/у=/у +/у= /y = /y

2)9,4х+(2х-11/у)-3/у = 9,4х+2х-11/у-3/у = 11,4x +8/y
9,4х+2х=11,4x
11/у-3/у = /y - /y = /y - /y = /y - /y = /y=
/y = 8/y

3)2 /х-(7х-1/у)+2/у= 4y - 4/x
2/х-7х = 2/х - 6/х = /x - 4/x = - 4/x
1/у+2/у=3/у = 3/y = 4y

4)3,5х+(6/х-7у)-7у = 3,5х+6/х-7у-7у = 6x-14y
3,5х+6/х = /х+/х =  /х+/х = /х+/х = /x=/x=6x