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14= x + 7r /*(-1)
6 = x + 3r
-14 = -x - 7r
------------------------------------- dodaję stronami
6 - 14 = x + 3r - x- 7r
-8 = x -x +3r-7r
- 8 = - 4r /:(-4)
-8 : (-4) = r
2= r
podstawiam obliczoną wartość r do jdnego z równań
6 = x + 3r
6 = x + 3*2
6 = x + 6
6-6 = x
0=x
spr.
14 = x + 7r
L= 14
P = x + 7r = 0 + 7*2= 0 + 14= 14
14=14
L=P