Помогите пожалуйста, ни как не получается решить, очень нужно вопрос жизни и смерти!!!!!!!

Задание . Построить математическую модель задачи линейного программирования


В институте проводится конкурс на лучшую стенгазету. Одному студенту дано следующее поручение:
- купить акварельной краски по цене 30р за коробку, цветные карандаши по цене 20р за коробку, линейки по цене 12р, блокноты по цене 10р,
- красок нужно купить не менее трех коробок, блокнотов- столько, сколько коробок карандашей и красок вместе, линеек не более пяти. На покупки выделяется не мене 300 р. В каком количестве студент должен купить указанные предметы, чтобы общее число предметов было наибольшим?

30x1+20x2+12x3+10x4=<300
x1+x2=x4
x1>=3
x4>=0
x4=<5

W*=x1+x2+x3+x4->max

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