Решите уравнения способом сложения:
{x-y=-10
2x+3y=15;
{3a+2b=1
2a+5b=8;
{2x+y=5
3x-5y=1;
{3x-2y=12
4x+3y=-1;
{x-y=-10
2x+3y=15;
{3a+2b=1
2a+5b=8;
{2x+y=5
3x-5y=1;
{3x-2y=12
4x+3y=-1;
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