21-9y+2y=7

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Solution for 21-9y+2y=7 equation: 


Simplifying
21 + -9y + 2y = 7

Combine like terms: -9y + 2y = -7y
21 + -7y = 7

Solving
21 + -7y = 7

Solving for variable 'y'.

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

Add '-21' to each side of the equation.
21 + -21 + -7y = 7 + -21

Combine like terms: 21 + -21 = 0
0 + -7y = 7 + -21
-7y = 7 + -21

Combine like terms: 7 + -21 = -14
-7y = -14

Divide each side by '-7'.
y = 2

Simplifying
y = 2

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