{a=b
2a+b=9
2*b+b=9
2b+b=9
3b=9 /:3
b=3
{a=3
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{a=b
2a+b=9
{a=b
2*b+b=9
{a=b
2b+b=9
{a=b
3b=9 /:3
{a=b
b=3
{a=3
b=3