21y-20y=20-13

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


Simplifying
21y + -20y = 20 + -13

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

Combine like terms: 20 + -13 = 7
1y = 7

Solving
1y = 7

Solving for variable 'y'.

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

Divide each side by '1'.
y = 7

Simplifying
y = 7

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