28=7-7y

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Solution for 28=7-7y equation: 


Simplifying
28 = 7 + -7y

Solving
28 = 7 + -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.
28 + 7y = 7 + -7y + 7y

Combine like terms: -7y + 7y = 0
28 + 7y = 7 + 0
28 + 7y = 7

Add '-28' to each side of the equation.
28 + -28 + 7y = 7 + -28

Combine like terms: 28 + -28 = 0
0 + 7y = 7 + -28
7y = 7 + -28

Combine like terms: 7 + -28 = -21
7y = -21

Divide each side by '7'.
y = -3

Simplifying
y = -3

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