Solve for d
d = \frac{41}{20} = 2\frac{1}{20} = 2.05
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2\times 8+5\times 5=20d
Variable d cannot be equal to 0 since division by zero is not defined. Multiply both sides of the equation by 10d, the least common multiple of 5d,2d.
16+25=20d
Do the multiplications.
41=20d
Add 16 and 25 to get 41.
20d=41
Swap sides so that all variable terms are on the left hand side.
d=\frac{41}{20}
Divide both sides by 20.
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