(y-9)-(y+6)=4y

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Solution for (y-9)-(y+6)=4y equation:


Simplifying
(y + -9) + -1(y + 6) = 4y

Reorder the terms:
(-9 + y) + -1(y + 6) = 4y

Remove parenthesis around (-9 + y)
-9 + y + -1(y + 6) = 4y

Reorder the terms:
-9 + y + -1(6 + y) = 4y
-9 + y + (6 * -1 + y * -1) = 4y
-9 + y + (-6 + -1y) = 4y

Reorder the terms:
-9 + -6 + y + -1y = 4y

Combine like terms: -9 + -6 = -15
-15 + y + -1y = 4y

Combine like terms: y + -1y = 0
-15 + 0 = 4y
-15 = 4y

Solving
-15 = 4y

Solving for variable 'y'.

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

Add '-4y' to each side of the equation.
-15 + -4y = 4y + -4y

Combine like terms: 4y + -4y = 0
-15 + -4y = 0

Add '15' to each side of the equation.
-15 + 15 + -4y = 0 + 15

Combine like terms: -15 + 15 = 0
0 + -4y = 0 + 15
-4y = 0 + 15

Combine like terms: 0 + 15 = 15
-4y = 15

Divide each side by '-4'.
y = -3.75

Simplifying
y = -3.75

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