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49+x -----wiek babci
8 razy x=49+x /-x
7x=49 /:7
x=7
7---wiek wnuka
49+7=56
Odpowiedź: Babcia ma 56 lat
x + 49 = 8x / - x
49 = 7x / ÷7
x = 7
7 + 49 = 56
7 × 8 = 56
ODP.: Babcia ma 56 lat.