99+21=5y-5

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Solution for 99+21=5y-5 equation: 


Simplifying
99 + 21 = 5y + -5

Combine like terms: 99 + 21 = 120
120 = 5y + -5

Reorder the terms:
120 = -5 + 5y

Solving
120 = -5 + 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.
120 + -5y = -5 + 5y + -5y

Combine like terms: 5y + -5y = 0
120 + -5y = -5 + 0
120 + -5y = -5

Add '-120' to each side of the equation.
120 + -120 + -5y = -5 + -120

Combine like terms: 120 + -120 = 0
0 + -5y = -5 + -120
-5y = -5 + -120

Combine like terms: -5 + -120 = -125
-5y = -125

Divide each side by '-5'.
y = 25

Simplifying
y = 25

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