{5x + 4y = -30
{3x - 9y = -18 | : 3
{x - 3y = -6 | + 3y
{x = 3y - 6
{5(3y - 6) + 4y = -30
{15y - 30 + 4y = -30 | + 30
{19y = 0 | : 19
{y = 0
{x = 3 · 0 - 6
{x = -6
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