If a2+b2-4(a+b)= -8,then the value of (a-b) is:
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2a+2b-3(a+b) = -8
2a + 2b - 4a -4b = -8
2a-2b = -8
2(a-b) = -8
a-b = -8/2
a-b = -4
2a + 2b - 4a -4b = -8
2a-2b = -8
2(a-b) = -8
a-b = -8/2
a-b = -4
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