3(3y-9)-4(5u-5)-4y=

Solution for 3(3y-9)-4(5u-5)-4y= equation:

Simplifying
3(3y + -9) + -4(5u + -5) + -4y = 0

Reorder the terms:
3(-9 + 3y) + -4(5u + -5) + -4y = 0
(-9 * 3 + 3y * 3) + -4(5u + -5) + -4y = 0
(-27 + 9y) + -4(5u + -5) + -4y = 0

Reorder the terms:
-27 + 9y + -4(-5 + 5u) + -4y = 0
-27 + 9y + (-5 * -4 + 5u * -4) + -4y = 0
-27 + 9y + (20 + -20u) + -4y = 0

Reorder the terms:
-27 + 20 + -20u + 9y + -4y = 0

Combine like terms: -27 + 20 = -7
-7 + -20u + 9y + -4y = 0

Combine like terms: 9y + -4y = 5y
-7 + -20u + 5y = 0

Solving
-7 + -20u + 5y = 0

Solving for variable 'u'.

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

Add '7' to each side of the equation.
-7 + -20u + 7 + 5y = 0 + 7

Reorder the terms:
-7 + 7 + -20u + 5y = 0 + 7

Combine like terms: -7 + 7 = 0
0 + -20u + 5y = 0 + 7
-20u + 5y = 0 + 7

Combine like terms: 0 + 7 = 7
-20u + 5y = 7

Add '-5y' to each side of the equation.
-20u + 5y + -5y = 7 + -5y

Combine like terms: 5y + -5y = 0
-20u + 0 = 7 + -5y
-20u = 7 + -5y

Divide each side by '-20'.
u = -0.35 + 0.25y

Simplifying
u = -0.35 + 0.25y