6y-21=-39+9y

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Solution for 6y-21=-39+9y equation:


Simplifying
6y + -21 = -39 + 9y

Reorder the terms:
-21 + 6y = -39 + 9y

Solving
-21 + 6y = -39 + 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 + 6y + -9y = -39 + 9y + -9y

Combine like terms: 6y + -9y = -3y
-21 + -3y = -39 + 9y + -9y

Combine like terms: 9y + -9y = 0
-21 + -3y = -39 + 0
-21 + -3y = -39

Add '21' to each side of the equation.
-21 + 21 + -3y = -39 + 21

Combine like terms: -21 + 21 = 0
0 + -3y = -39 + 21
-3y = -39 + 21

Combine like terms: -39 + 21 = -18
-3y = -18

Divide each side by '-3'.
y = 6

Simplifying
y = 6

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