Solve for b
b=-15
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-5=\frac{5\times 8}{4}+b
Express \frac{5}{4}\times 8 as a single fraction.
-5=\frac{40}{4}+b
Multiply 5 and 8 to get 40.
-5=10+b
Divide 40 by 4 to get 10.
10+b=-5
Swap sides so that all variable terms are on the left hand side.
b=-5-10
Subtract 10 from both sides.
b=-15
Subtract 10 from -5 to get -15.
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