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2y+8+y\left(-1\right)=3y
Variable y cannot be equal to 0 since division by zero is not defined. Multiply both sides of the equation by y.
y+8=3y
Combine 2y and y\left(-1\right) to get y.
y+8-3y=0
Subtract 3y from both sides.
-2y+8=0
Combine y and -3y to get -2y.
-2y=-8
Subtract 8 from both sides. Anything subtracted from zero gives its negation.
y=\frac{-8}{-2}
Divide both sides by -2.
y=4
Divide -8 by -2 to get 4.