0=21-7y

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Solution for 0=21-7y equation: 


Simplifying
0 = 21 + -7y

Solving
0 = 21 + -7y

Solving for variable 'y'.

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

Add '7y' to each side of the equation.
0 + 7y = 21 + -7y + 7y
Remove the zero:
7y = 21 + -7y + 7y

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

Divide each side by '7'.
y = 3

Simplifying
y = 3

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