21-7y=20

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Solution for 21-7y=20 equation: 


Simplifying
21 + -7y = 20

Solving
21 + -7y = 20

Solving for variable 'y'.

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

Add '-21' to each side of the equation.
21 + -21 + -7y = 20 + -21

Combine like terms: 21 + -21 = 0
0 + -7y = 20 + -21
-7y = 20 + -21

Combine like terms: 20 + -21 = -1
-7y = -1

Divide each side by '-7'.
y = 0.1428571429

Simplifying
y = 0.1428571429

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