91=5y-9

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Solution for 91=5y-9 equation:


Simplifying
91 = 5y + -9

Reorder the terms:
91 = -9 + 5y

Solving
91 = -9 + 5y

Solving for variable 'y'.

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

Add '-5y' to each side of the equation.
91 + -5y = -9 + 5y + -5y

Combine like terms: 5y + -5y = 0
91 + -5y = -9 + 0
91 + -5y = -9

Add '-91' to each side of the equation.
91 + -91 + -5y = -9 + -91

Combine like terms: 91 + -91 = 0
0 + -5y = -9 + -91
-5y = -9 + -91

Combine like terms: -9 + -91 = -100
-5y = -100

Divide each side by '-5'.
y = 20

Simplifying
y = 20

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