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y- podstawa trójkąta równoramiennego
2x+y=26/ *(-1)
2x+6y=66
-2x - y=-26
2x+6y=66
(-2x-y)+(2x+6y) = -26+66
5y=40/ :5
y=8
2x+8=26/-8
2x=18/ :2
x=9