y=3(-2y-21)

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Solution for y=3(-2y-21) equation:


Simplifying
y = 3(-2y + -21)

Reorder the terms:
y = 3(-21 + -2y)
y = (-21 * 3 + -2y * 3)
y = (-63 + -6y)

Solving
y = -63 + -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.
y + 6y = -63 + -6y + 6y

Combine like terms: y + 6y = 7y
7y = -63 + -6y + 6y

Combine like terms: -6y + 6y = 0
7y = -63 + 0
7y = -63

Divide each side by '7'.
y = -9

Simplifying
y = -9

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