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2x-5y/5+x-2y/3= 1/3 /x15
21x-7y-21x+3y=0
30x-15y+15x -10y=5
-4y=0
45x-25y=5
y=0
45x=5
y=0
x=9
c) x+y/2+2x+y/3=4 /x6
2x-y/4-x+y/6= -1/6 /x12
x+3y+12x+2y=24
24x-3y-12x+2y=-2
13x+5y=24
12x-y=-2 /x5
13x+5y=24
60x-5y=-10
+/
73x=14/:73
x=5.21
y=?
13x+5y=24
13x5.21-24=-5y
-5y=43,73/ :(-5)
y=8 i 3/4
x=5.21
y=8.75