(3y-9)-(12-3y)=2y-1

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Solution for (3y-9)-(12-3y)=2y-1 equation:


Simplifying
(3y + -9) + -1(12 + -3y) = 2y + -1

Reorder the terms:
(-9 + 3y) + -1(12 + -3y) = 2y + -1

Remove parenthesis around (-9 + 3y)
-9 + 3y + -1(12 + -3y) = 2y + -1
-9 + 3y + (12 * -1 + -3y * -1) = 2y + -1
-9 + 3y + (-12 + 3y) = 2y + -1

Reorder the terms:
-9 + -12 + 3y + 3y = 2y + -1

Combine like terms: -9 + -12 = -21
-21 + 3y + 3y = 2y + -1

Combine like terms: 3y + 3y = 6y
-21 + 6y = 2y + -1

Reorder the terms:
-21 + 6y = -1 + 2y

Solving
-21 + 6y = -1 + 2y

Solving for variable 'y'.

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

Add '-2y' to each side of the equation.
-21 + 6y + -2y = -1 + 2y + -2y

Combine like terms: 6y + -2y = 4y
-21 + 4y = -1 + 2y + -2y

Combine like terms: 2y + -2y = 0
-21 + 4y = -1 + 0
-21 + 4y = -1

Add '21' to each side of the equation.
-21 + 21 + 4y = -1 + 21

Combine like terms: -21 + 21 = 0
0 + 4y = -1 + 21
4y = -1 + 21

Combine like terms: -1 + 21 = 20
4y = 20

Divide each side by '4'.
y = 5

Simplifying
y = 5

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