3y-21=-9+7y

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Solution for 3y-21=-9+7y equation:


Simplifying
3y + -21 = -9 + 7y

Reorder the terms:
-21 + 3y = -9 + 7y

Solving
-21 + 3y = -9 + 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.
-21 + 3y + -7y = -9 + 7y + -7y

Combine like terms: 3y + -7y = -4y
-21 + -4y = -9 + 7y + -7y

Combine like terms: 7y + -7y = 0
-21 + -4y = -9 + 0
-21 + -4y = -9

Add '21' to each side of the equation.
-21 + 21 + -4y = -9 + 21

Combine like terms: -21 + 21 = 0
0 + -4y = -9 + 21
-4y = -9 + 21

Combine like terms: -9 + 21 = 12
-4y = 12

Divide each side by '-4'.
y = -3

Simplifying
y = -3

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