x - cena zeszytu
x+26 - cena bloku
12x+3(x+26)=213
12x+3x+78=213
15x=213-78
15x=135
x=135:15
x=9 cena zeszytu
9+26=35 cena bloku
spr.
12*9+3*35=108+105=213
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x - cena zeszytu
x+26 - cena bloku
12x+3(x+26)=213
12x+3x+78=213
15x=213-78
15x=135
x=135:15
x=9 cena zeszytu
9+26=35 cena bloku
spr.
12*9+3*35=108+105=213