36x-18=18y и 18x+y=21
18y=36x-18
y=2x-1
18x+y=21
y=21-18x
2x-1=21-18x
20x=22
x=22/20
x=1.1=1
y=21-18=3
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36x-18=18y и 18x+y=21
18y=36x-18
y=2x-1
18x+y=21
y=21-18x
2x-1=21-18x
20x=22
x=22/20
x=1.1=1
y=21-18=3