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3a=18
a=6
Te liczby to 6,7,8
3x=18 /:3
x=6
x=6
x+1=7
x+2=8
Odp. Te liczby to 6, 7 i 8
3x+3=21
3x=21-3
3x=18 /:3
x=6
spr. 6+(6+1)+(6+2)=6+7+8=21