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a(150 - a - 2b) = 0 -wyłączyłam a przed nawias
b = 0 lub 150 - b - 2a = 0
a = 0 lub 150 - a - 2b = 0
b = 0 lub 2a + b = 150
a = 0 lub a + 2b = 150
b = 0 lub b = 0 lub b=150 lub b = 50
a = 0 a = 150 a = 0 a = 50