-3(y+5)-21=0

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Solution for -3(y+5)-21=0 equation:


Simplifying
-3(y + 5) + -21 = 0

Reorder the terms:
-3(5 + y) + -21 = 0
(5 * -3 + y * -3) + -21 = 0
(-15 + -3y) + -21 = 0

Reorder the terms:
-15 + -21 + -3y = 0

Combine like terms: -15 + -21 = -36
-36 + -3y = 0

Solving
-36 + -3y = 0

Solving for variable 'y'.

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

Add '36' to each side of the equation.
-36 + 36 + -3y = 0 + 36

Combine like terms: -36 + 36 = 0
0 + -3y = 0 + 36
-3y = 0 + 36

Combine like terms: 0 + 36 = 36
-3y = 36

Divide each side by '-3'.
y = -12

Simplifying
y = -12

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