if (3b,6)=(a-10,2a+b) then value of a-b is
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a=3b+10 (1)
2a+b=6 (2)
so,
replacing a in equation (2) we get,7b+20=6
or, b= -2
substituting value of bin equation (1),
a=-6+10=-4
hence your answer for a-b is -4+2=-2.
hope it helps
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