To wszystko w 1 {
----> -6x+9y=-21
Jedna klamerka ----> 6x-10u=22
przed tymi 2
-6x+9y=-21
6x-10y=22
_________
-y=1
y=-1
6x+10=22
6x=12
x=2
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-6x+9y=-21
6x-10y=22
_________
-y=1
y=-1
y=-1
6x+10=22
y=-1
6x=12
x=2
y=-1