21y-y=100

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Solution for 21y-y=100 equation: 


Simplifying
21y + -1y = 100

Combine like terms: 21y + -1y = 20y
20y = 100

Solving
20y = 100

Solving for variable 'y'.

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

Divide each side by '20'.
y = 5

Simplifying
y = 5

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