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2(x+1)=2y
5x - y = 7
2x + 2 = 2y
5x - y = 7 - mnożymy przez - 2
2x - 2y = - 2
-10x +2y = - 14
2x - 2y = - 2
dodajemy stronami
10x + 2x =- 2 - 14
- 8x = - 16
x = 16/8 = 2
2x - 2y = - 2
2 razy 2 - 2y = - 2
4 - 2y = -2
- 2y = -6
y = 6/2 = 3
x = 2
y = 3