If the equations $x^2+ax+12=0, x^2+bx=15=0$ and $x^2(a+b)x+36=0$ have a common positive root then ordered pair (a,b) is
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If the equations $x^2+ax+12=0, x^2+bx=15=0$ and $x^2(a+b)x+36=0$ have a common positive root then ordered pair (a,b) is