y*7=y-21

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Solution for y*7=y-21 equation:


Simplifying
y * 7 = y + -21

Reorder the terms for easier multiplication:
7y = y + -21

Reorder the terms:
7y = -21 + y

Solving
7y = -21 + y

Solving for variable 'y'.

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

Add '-1y' to each side of the equation.
7y + -1y = -21 + y + -1y

Combine like terms: 7y + -1y = 6y
6y = -21 + y + -1y

Combine like terms: y + -1y = 0
6y = -21 + 0
6y = -21

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

Simplifying
y = -3.5

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