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8x-3y=20 *3
toz
-24x+56y=-104
24x-9y=60
dodawamy rowniania
mamy
-24x+56y+24x-9y=-104+60
8x-3y=20
toz
47y=-44
8x-3y=20
toz
y=-44/47
8x-3*(-44/47)=20
toz
y=-44/47
8x+132/47=20/1
toz
y=-44/47
8x=(940-132)/47
toz
y=-44/47
8x=808/47
toz
y=-44/47
x=101/47
toz
y=-44/47
x=2 7/47