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4x - waga jabłek
x-18 - waga śliw
126 - waga owoców
x+4x+x-18 - waga owoców
x+4x+x-18=126
x+4x+x=126+18
6x=144 /:6
x=24 t - waga gruszek
4x=4·24=96 t - waga jabłek
x-18=24-18=6 t - waga śliw