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3\left(10-3y\right)=4\left(5-y\right)
Multiply both sides of the equation by 12, the least common multiple of 4,3.
30-9y=4\left(5-y\right)
Use the distributive property to multiply 3 by 10-3y.
30-9y=20-4y
Use the distributive property to multiply 4 by 5-y.
30-9y+4y=20
Add 4y to both sides.
30-5y=20
Combine -9y and 4y to get -5y.
-5y=20-30
Subtract 30 from both sides.
-5y=-10
Subtract 30 from 20 to get -10.
y=\frac{-10}{-5}
Divide both sides by -5.
y=2
Divide -10 by -5 to get 2.