y=7y-21

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Solution for y=7y-21 equation: 


Simplifying
y = 7y + -21

Reorder the terms:
y = -21 + 7y

Solving
y = -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.
y + -7y = -21 + 7y + -7y

Combine like terms: y + -7y = -6y
-6y = -21 + 7y + -7y

Combine like terms: 7y + -7y = 0
-6y = -21 + 0
-6y = -21

Divide each side by '-6'.
y = 3.5

Simplifying
y = 3.5

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