3=1/2b+11 solve for b
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3=1/2b+11
Subtracting 11
3 - 11 = 1/2b +11 -11
3 - 11 = 1/2b +11 -11
-8 = 1/2b + 0
1/2b= -8
Multiplying by two
(1/2)*2 b= -8*2
1*b = -16
b= -16
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Answer
b= -16