Szczegółowe wyjaśnienie:
wafel - x
sok x-2
zatem
3(x-2)+3×=18
3x-6+3x= 18
6x=18+6
6x= 24 /:6
x= 4
wafel 4 zl
sok 4 zl - 2 zl = 2 zl
3x2 zl + 3x4 zl = 6 zl + 12 zl = 18 zl
