7y-21=-31+9y

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Solution for 7y-21=-31+9y equation:


Simplifying
7y + -21 = -31 + 9y

Reorder the terms:
-21 + 7y = -31 + 9y

Solving
-21 + 7y = -31 + 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 + 7y + -9y = -31 + 9y + -9y

Combine like terms: 7y + -9y = -2y
-21 + -2y = -31 + 9y + -9y

Combine like terms: 9y + -9y = 0
-21 + -2y = -31 + 0
-21 + -2y = -31

Add '21' to each side of the equation.
-21 + 21 + -2y = -31 + 21

Combine like terms: -21 + 21 = 0
0 + -2y = -31 + 21
-2y = -31 + 21

Combine like terms: -31 + 21 = -10
-2y = -10

Divide each side by '-2'.
y = 5

Simplifying
y = 5

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