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10x + 2 = -14 |-2
x - 2y = -8
10x = -14
x - 2y = -8 |*(-10)
10x = -14
-10x + 20y = 80
---------------------- (+) dodajemy obustronnie
20y = 64 /:20
y = 3,2
x - 2 * 3,2 = -8
x - 6,4 = -8
x = -8 + 6,4
x = -1,6
{x = -1,6
{y = 3,2