9y-9y=-21+y

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


Simplifying
9y + -9y = -21 + y

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

Solving
0 = -21 + y

Solving for variable 'y'.

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

Add '-1y' to each side of the equation.
0 + -1y = -21 + y + -1y
Remove the zero:
-1y = -21 + y + -1y

Combine like terms: y + -1y = 0
-1y = -21 + 0
-1y = -21

Divide each side by '-1'.
y = 21

Simplifying
y = 21

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