(y-1)-0.75(-y)=3(y)

Solution for (y-1)-0.75(-y)=3(y) equation:

Simplifying
(y + -1) + -0.75(-1y) = 3(y)

Reorder the terms:
(-1 + y) + -0.75(-1y) = 3(y)

Remove parenthesis around (-1 + y)
-1 + y + -0.75(-1y) = 3(y)

Remove parenthesis around (-1y)
-1 + y + -0.75 * -1y = 3(y)

Multiply -0.75 * -1
-1 + y + 0.75y = 3(y)

Combine like terms: y + 0.75y = 1.75y
-1 + 1.75y = 3(y)

Solving
-1 + 1.75y = 3y

Solving for variable 'y'.

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

Add '-3y' to each side of the equation.
-1 + 1.75y + -3y = 3y + -3y

Combine like terms: 1.75y + -3y = -1.25y
-1 + -1.25y = 3y + -3y

Combine like terms: 3y + -3y = 0
-1 + -1.25y = 0

Add '1' to each side of the equation.
-1 + 1 + -1.25y = 0 + 1

Combine like terms: -1 + 1 = 0
0 + -1.25y = 0 + 1
-1.25y = 0 + 1

Combine like terms: 0 + 1 = 1
-1.25y = 1

Divide each side by '-1.25'.
y = -0.8

Simplifying
y = -0.8