Solve for b
b=-2.5
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5=7.5+b
Multiply 2.5 and 3 to get 7.5.
7.5+b=5
Swap sides so that all variable terms are on the left hand side.
b=5-7.5
Subtract 7.5 from both sides.
b=-2.5
Subtract 7.5 from 5 to get -2.5.
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