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Sk1 - składnik 1
Sk2 -składnik 2
Sk1 = S - 217
Sk2 = Sk1 -12
S = Sk1 + Sk2
S = S -217 + S-217 (porządkujemy)
-S = - 434 / (-1)
S = 434
Odp: Suma wynosi 434