21y-20y=8+13

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Solution for 21y-20y=8+13 equation: 


Simplifying
21y + -20y = 8 + 13

Combine like terms: 21y + -20y = 1y
1y = 8 + 13

Combine like terms: 8 + 13 = 21
1y = 21

Solving
1y = 21

Solving for variable 'y'.

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

Divide each side by '1'.
y = 21

Simplifying
y = 21

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