Question 1130654

{{{x -y = 9}}}
{{{(1/3) x = (1/3) y + 3}}}
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{{{x -y = 9}}}
{{{(1/3) x -(1/3) y= 3}}}


*[invoke solving_linear_system_by_elimination 1, -1, 9, "1/3", "-1/3", 3]