Here is your answer:
-55.04 + b + 39.68 = -71.03
Add 55.04 on both sides:
-71.03 + 55.04=-15.99
b + 39.68 = -15.99
Subtract 39.68 on both sides:
-15.99-39.68=-55.67
b=-55.67
Hope this helps!
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