Combine 8/(5d)-7/(4d)

Math
85d-74d
To write 85d as a fraction with a common denominator, multiply by 44.
85d⋅44-74d
To write -74d as a fraction with a common denominator, multiply by 55.
85d⋅44-74d⋅55
Write each expression with a common denominator of 20d, by multiplying each by an appropriate factor of 1.
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Multiply 85d and 44.
8⋅45d⋅4-74d⋅55
Multiply 4 by 5.
8⋅420d-74d⋅55
Multiply 74d and 55.
8⋅420d-7⋅54d⋅5
Multiply 5 by 4.
8⋅420d-7⋅520d
8⋅420d-7⋅520d
Combine the numerators over the common denominator.
8⋅4-7⋅520d
Simplify the numerator.
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Multiply 8 by 4.
32-7⋅520d
Multiply -7 by 5.
32-3520d
Subtract 35 from 32.
-320d
-320d
Move the negative in front of the fraction.
-320d
Combine 8/(5d)-7/(4d)

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