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12 - 14
14x= 12(x+3)
14x= 12x+36
14x-12x= 36
2x=36 / :2
x = 18
x/12=(x+3)/12+2
x/12=(x+3)/14
14x=12(x+3)
14x=12x+36
14x-12x=36
2x=36 /:2
x=18
18+3=21
Teraz w sadzie rośnie 21 jabłoni.