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12-4\left(d+5\right)=3\times 3\left(d-1\right)
Multiply both sides of the equation by 12, the least common multiple of 3,4.
12-4d-20=3\times 3\left(d-1\right)
Use the distributive property to multiply -4 by d+5.
-8-4d=3\times 3\left(d-1\right)
Subtract 20 from 12 to get -8.
-8-4d=9\left(d-1\right)
Multiply 3 and 3 to get 9.
-8-4d=9d-9
Use the distributive property to multiply 9 by d-1.
-8-4d-9d=-9
Subtract 9d from both sides.
-8-13d=-9
Combine -4d and -9d to get -13d.
-13d=-9+8
Add 8 to both sides.
-13d=-1
Add -9 and 8 to get -1.
d=\frac{-1}{-13}
Divide both sides by -13.
d=\frac{1}{13}
Fraction \frac{-1}{-13} can be simplified to \frac{1}{13} by removing the negative sign from both the numerator and the denominator.