15y+9=12y-42

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Solution for 15y+9=12y-42 equation:


Simplifying
15y + 9 = 12y + -42

Reorder the terms:
9 + 15y = 12y + -42

Reorder the terms:
9 + 15y = -42 + 12y

Solving
9 + 15y = -42 + 12y

Solving for variable 'y'.

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

Add '-12y' to each side of the equation.
9 + 15y + -12y = -42 + 12y + -12y

Combine like terms: 15y + -12y = 3y
9 + 3y = -42 + 12y + -12y

Combine like terms: 12y + -12y = 0
9 + 3y = -42 + 0
9 + 3y = -42

Add '-9' to each side of the equation.
9 + -9 + 3y = -42 + -9

Combine like terms: 9 + -9 = 0
0 + 3y = -42 + -9
3y = -42 + -9

Combine like terms: -42 + -9 = -51
3y = -51

Divide each side by '3'.
y = -17

Simplifying
y = -17

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