Пожалуйста помогите Дам 40 баллов!
1) {4x-5y=10 { {- это одна большая дужка
{2x-2,5y=8

2){x-2y=5
{2x-3y=9


3){x-y=7
{2x-3y=9


4){a-3b=8
{2a-3b=10
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