-3y-3(y-5)=21

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Solution for -3y-3(y-5)=21 equation: 


Simplifying
-3y + -3(y + -5) = 21

Reorder the terms:
-3y + -3(-5 + y) = 21
-3y + (-5 * -3 + y * -3) = 21
-3y + (15 + -3y) = 21

Reorder the terms:
15 + -3y + -3y = 21

Combine like terms: -3y + -3y = -6y
15 + -6y = 21

Solving
15 + -6y = 21

Solving for variable 'y'.

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

Add '-15' to each side of the equation.
15 + -15 + -6y = 21 + -15

Combine like terms: 15 + -15 = 0
0 + -6y = 21 + -15
-6y = 21 + -15

Combine like terms: 21 + -15 = 6
-6y = 6

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

Simplifying
y = -1

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