Answer:
n=1
Explanation:
(-y + 3) + (2y - 4) = (ny - 1)
-y + 3 + 2y - 4 = ny - 1
-y + 2y + 3 - 4 = ny - 1 -> combine like terms on the left side of the equation
y - 1 = ny - 1 ==> simplify
y - 1 + 1 = ny - 1 + 1
y = ny ==> solve for n
y/y = ny/y
1 = n ==> n=1