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156:13=12
12x2=24
12x4=48
12x7=84
13x=156 /:13
x=12 jednostka
2*12=24
4*12=48
7*12=84
24+48+84=156
13x=156
x=12
pierwszy szkładnik: 2x=2*12=24
drugi 4x=4*12=48
trzeci 7x=7*12=84