(y+-9)-(y-4)=5y

Solution for (y+-9)-(y-4)=5y equation:

Simplifying
(y + -9) + -1(y + -4) = 5y

Reorder the terms:
(-9 + y) + -1(y + -4) = 5y

Remove parenthesis around (-9 + y)
-9 + y + -1(y + -4) = 5y

Reorder the terms:
-9 + y + -1(-4 + y) = 5y
-9 + y + (-4 * -1 + y * -1) = 5y
-9 + y + (4 + -1y) = 5y

Reorder the terms:
-9 + 4 + y + -1y = 5y

Combine like terms: -9 + 4 = -5
-5 + y + -1y = 5y

Combine like terms: y + -1y = 0
-5 + 0 = 5y
-5 = 5y

Solving
-5 = 5y

Solving for variable 'y'.

Move all terms containing y to the left, all other terms to the right.

Add '-5y' to each side of the equation.
-5 + -5y = 5y + -5y

Combine like terms: 5y + -5y = 0
-5 + -5y = 0

Add '5' to each side of the equation.
-5 + 5 + -5y = 0 + 5

Combine like terms: -5 + 5 = 0
0 + -5y = 0 + 5
-5y = 0 + 5

Combine like terms: 0 + 5 = 5
-5y = 5

Divide each side by '-5'.
y = -1

Simplifying
y = -1