9y-21=-42+6y

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Solution for 9y-21=-42+6y equation:


Simplifying
9y + -21 = -42 + 6y

Reorder the terms:
-21 + 9y = -42 + 6y

Solving
-21 + 9y = -42 + 6y

Solving for variable 'y'.

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

Add '-6y' to each side of the equation.
-21 + 9y + -6y = -42 + 6y + -6y

Combine like terms: 9y + -6y = 3y
-21 + 3y = -42 + 6y + -6y

Combine like terms: 6y + -6y = 0
-21 + 3y = -42 + 0
-21 + 3y = -42

Add '21' to each side of the equation.
-21 + 21 + 3y = -42 + 21

Combine like terms: -21 + 21 = 0
0 + 3y = -42 + 21
3y = -42 + 21

Combine like terms: -42 + 21 = -21
3y = -21

Divide each side by '3'.
y = -7

Simplifying
y = -7

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