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{6a+9b=126
2a+2b=36
6a+9b=126
a=18-b
6*18-6b+9b=126
108+3b=126
3b=18
b=6
a=12
{6a+9b=126
{2a=54-2b-18
{6a+9b=126
{a=27-b-9
{2*(27-b-9)+3b=42
{a=18-b
{2*(18-b)+3b=42
{a=18-b
{36-2b+3b=42
{a=18-b
{b=6
{b=6
{a=18-b
{b=6
{a=18-6
{b=6
{a=12