31=y-9

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Solution for 31=y-9 equation:


Simplifying
31 = y + -9

Reorder the terms:
31 = -9 + y

Solving
31 = -9 + 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.
31 + -1y = -9 + y + -1y

Combine like terms: y + -1y = 0
31 + -1y = -9 + 0
31 + -1y = -9

Add '-31' to each side of the equation.
31 + -31 + -1y = -9 + -31

Combine like terms: 31 + -31 = 0
0 + -1y = -9 + -31
-1y = -9 + -31

Combine like terms: -9 + -31 = -40
-1y = -40

Divide each side by '-1'.
y = 40

Simplifying
y = 40

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