3y+21=9(y+3)

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Solution for 3y+21=9(y+3) equation:


Simplifying
3y + 21 = 9(y + 3)

Reorder the terms:
21 + 3y = 9(y + 3)

Reorder the terms:
21 + 3y = 9(3 + y)
21 + 3y = (3 * 9 + y * 9)
21 + 3y = (27 + 9y)

Solving
21 + 3y = 27 + 9y

Solving for variable 'y'.

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

Add '-9y' to each side of the equation.
21 + 3y + -9y = 27 + 9y + -9y

Combine like terms: 3y + -9y = -6y
21 + -6y = 27 + 9y + -9y

Combine like terms: 9y + -9y = 0
21 + -6y = 27 + 0
21 + -6y = 27

Add '-21' to each side of the equation.
21 + -21 + -6y = 27 + -21

Combine like terms: 21 + -21 = 0
0 + -6y = 27 + -21
-6y = 27 + -21

Combine like terms: 27 + -21 = 6
-6y = 6

Divide each side by '-6'.
y = -1

Simplifying
y = -1

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