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7\left(6-y\right)-84=4\left(2y+6\right)-14\left(y+4\right)
Multiply both sides of the equation by 28, the least common multiple of 4,7,2.
42-7y-84=4\left(2y+6\right)-14\left(y+4\right)
Use the distributive property to multiply 7 by 6-y.
-42-7y=4\left(2y+6\right)-14\left(y+4\right)
Subtract 84 from 42 to get -42.
-42-7y=8y+24-14\left(y+4\right)
Use the distributive property to multiply 4 by 2y+6.
-42-7y=8y+24-14y-56
Use the distributive property to multiply -14 by y+4.
-42-7y=-6y+24-56
Combine 8y and -14y to get -6y.
-42-7y=-6y-32
Subtract 56 from 24 to get -32.
-42-7y+6y=-32
Add 6y to both sides.
-42-y=-32
Combine -7y and 6y to get -y.
-y=-32+42
Add 42 to both sides.
-y=10
Add -32 and 42 to get 10.
y=-10
Multiply both sides by -1.