9-3y+12=7y-15+2y

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Solution for 9-3y+12=7y-15+2y equation:


Simplifying
9 + -3y + 12 = 7y + -15 + 2y

Reorder the terms:
9 + 12 + -3y = 7y + -15 + 2y

Combine like terms: 9 + 12 = 21
21 + -3y = 7y + -15 + 2y

Reorder the terms:
21 + -3y = -15 + 7y + 2y

Combine like terms: 7y + 2y = 9y
21 + -3y = -15 + 9y

Solving
21 + -3y = -15 + 9y

Solving for variable 'y'.

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

Add '-9y' to each side of the equation.
21 + -3y + -9y = -15 + 9y + -9y

Combine like terms: -3y + -9y = -12y
21 + -12y = -15 + 9y + -9y

Combine like terms: 9y + -9y = 0
21 + -12y = -15 + 0
21 + -12y = -15

Add '-21' to each side of the equation.
21 + -21 + -12y = -15 + -21

Combine like terms: 21 + -21 = 0
0 + -12y = -15 + -21
-12y = -15 + -21

Combine like terms: -15 + -21 = -36
-12y = -36

Divide each side by '-12'.
y = 3

Simplifying
y = 3

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