Odpowiedzi

2010-02-14T20:14:09+01:00
2(x-3)+3(y-5)=4(x-1)-3(y-7)
2x-6+3y-15=4x-4-3y+21
2x-21=4x+17
2x-4x=21+17
-2x=38 |:-2
x=-19

2(x+y)-5(y-x)=3(2x-y)+5(5x-3y)
2x+2y-5y+5x=6x-3y+25x-15y
7x-3y=31x-18y
7x-31x=-18y+3y
-24x=-15y