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Jaś = x
Tomek = 7x
Grześ = 7x - 200
Razem = 1420
x + 7x + 7x - 200 = 1420
15x = 1420 + 200
15x = 1620 |:15
x = 108
Jaś = 108
Tomek = 7 x 108 = 756
Grześ = 756 - 200 = 556