-21=3(y-3)+3y

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


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

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

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

Solving
-21 = -9 + 6y

Solving for variable 'y'.

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

Add '-6y' to each side of the equation.
-21 + -6y = -9 + 6y + -6y

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

Add '21' to each side of the equation.
-21 + 21 + -6y = -9 + 21

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

Combine like terms: -9 + 21 = 12
-6y = 12

Divide each side by '-6'.
y = -2

Simplifying
y = -2

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