7y-21=-21+4y

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Solution for 7y-21=-21+4y equation:


Simplifying
7y + -21 = -21 + 4y

Reorder the terms:
-21 + 7y = -21 + 4y

Add '21' to each side of the equation.
-21 + 21 + 7y = -21 + 21 + 4y

Combine like terms: -21 + 21 = 0
0 + 7y = -21 + 21 + 4y
7y = -21 + 21 + 4y

Combine like terms: -21 + 21 = 0
7y = 0 + 4y
7y = 4y

Solving
7y = 4y

Solving for variable 'y'.

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

Add '-4y' to each side of the equation.
7y + -4y = 4y + -4y

Combine like terms: 7y + -4y = 3y
3y = 4y + -4y

Combine like terms: 4y + -4y = 0
3y = 0

Divide each side by '3'.
y = 0

Simplifying
y = 0

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