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y-x=45
y-(5-y)=45
y-5+y=45
2y=50
y=25
y-x=45
25-x=45
-x=45-25
-x=20
x=-20
cos jest nie tak w tresci bo wychodzi 4cyfrowa..
10y-x=45
y=-5+10x
10(-5+10x)-x=45
-50+100x-x=45
99x=45+50
x=95/99
y=-5+ 950/99