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y - partia trąbek
x-4=y+4
x+4=3(y-4)
x-4=y+4
x+4=3y-12
x=y
y+4=3y-12
x=y
y-3y=-12-4
x=y
-2y=-16 / :(-2)
x=y
y=8
x=8
y partia trąbek
x-4=y+4
x+4=3(y-4)
x=y
y+4=3y-12
2y=16
y=8
x=8