9y+6=21y-6

Solution for 9y+6=21y-6 equation:

Simplifying
9y + 6 = 21y + -6

Reorder the terms:
6 + 9y = 21y + -6

Reorder the terms:
6 + 9y = -6 + 21y

Solving
6 + 9y = -6 + 21y

Solving for variable 'y'.

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

Add '-21y' to each side of the equation.
6 + 9y + -21y = -6 + 21y + -21y

Combine like terms: 9y + -21y = -12y
6 + -12y = -6 + 21y + -21y

Combine like terms: 21y + -21y = 0
6 + -12y = -6 + 0
6 + -12y = -6

Add '-6' to each side of the equation.
6 + -6 + -12y = -6 + -6

Combine like terms: 6 + -6 = 0
0 + -12y = -6 + -6
-12y = -6 + -6

Combine like terms: -6 + -6 = -12
-12y = -12

Divide each side by '-12'.
y = 1

Simplifying
y = 1