[tex]3y + 4y + 20 + y = 180 \\ 3y + 4y + y = 180 - 20 \\ 8y = 160 \: \: | \div 8 \\ y = 20[/tex]
[tex] \gamma = 20[/tex]
[tex]3 \gamma = 3 \times 20 = 60[/tex]
[tex]4 \gamma + 20 = 4 \times 20 + 20 = 80 + 20 = 100[/tex]
sprawdzenie:
20 + 60 + 100 = 180
