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