Помогите пожалуйста!!!

Розв'язати системи методом підстановки:

x+y=5,
x-y=1;

5x-2y=6,
7x+2y=6;

9x+17y=52,
26x-17y=18;

9x-6y=24,
9x+8y=10.​​
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