9=7y-13y-21

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Solution for 9=7y-13y-21 equation:


Simplifying
9 = 7y + -13y + -21

Reorder the terms:
9 = -21 + 7y + -13y

Combine like terms: 7y + -13y = -6y
9 = -21 + -6y

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

Combine like terms: -6y + 6y = 0
9 + 6y = -21 + 0
9 + 6y = -21

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

Combine like terms: 9 + -9 = 0
0 + 6y = -21 + -9
6y = -21 + -9

Combine like terms: -21 + -9 = -30
6y = -30

Divide each side by '6'.
y = -5

Simplifying
y = -5

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