7y-21-9y+31=

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


Simplifying
7y + -21 + -9y + 31 = 0

Reorder the terms:
-21 + 31 + 7y + -9y = 0

Combine like terms: -21 + 31 = 10
10 + 7y + -9y = 0

Combine like terms: 7y + -9y = -2y
10 + -2y = 0

Solving
10 + -2y = 0

Solving for variable 'y'.

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

Add '-10' to each side of the equation.
10 + -10 + -2y = 0 + -10

Combine like terms: 10 + -10 = 0
0 + -2y = 0 + -10
-2y = 0 + -10

Combine like terms: 0 + -10 = -10
-2y = -10

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

Simplifying
y = 5

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