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9\left(3y-1\right)-12=2\left(5y-7\right)
Multiply both sides of the equation by 12, the least common multiple of 4,6.
27y-9-12=2\left(5y-7\right)
Use the distributive property to multiply 9 by 3y-1.
27y-21=2\left(5y-7\right)
Subtract 12 from -9 to get -21.
27y-21=10y-14
Use the distributive property to multiply 2 by 5y-7.
27y-21-10y=-14
Subtract 10y from both sides.
17y-21=-14
Combine 27y and -10y to get 17y.
17y=-14+21
Add 21 to both sides.
17y=7
Add -14 and 21 to get 7.
y=\frac{7}{17}
Divide both sides by 17.