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y - krótszy odcinek
x+y = 12
1/4(x-y) = 1/6x
x = 12-y
1/4(12-y-y) = 1/6(12-y)
x = 12-y
3-1/2y = 2-1/6y
x = 12-y
1 = -1/6y + 1/2y
x = 12-y
1 = -1/6y + 3/6y
x = 12-y
1 = 2/6y
x = 12-y
1 = 1/3y /:1/3
x = 12-y
3 = y
x=12-3
y = 3
x = 9
y = 3