7y+21=3y-3

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


Simplifying
7y + 21 = 3y + -3

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

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

Solving
21 + 7y = -3 + 3y

Solving for variable 'y'.

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

Add '-3y' to each side of the equation.
21 + 7y + -3y = -3 + 3y + -3y

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

Combine like terms: 3y + -3y = 0
21 + 4y = -3 + 0
21 + 4y = -3

Add '-21' to each side of the equation.
21 + -21 + 4y = -3 + -21

Combine like terms: 21 + -21 = 0
0 + 4y = -3 + -21
4y = -3 + -21

Combine like terms: -3 + -21 = -24
4y = -24

Divide each side by '4'.
y = -6

Simplifying
y = -6

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