-3y+21=-8(y+3)

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Solution for -3y+21=-8(y+3) equation:


Simplifying
-3y + 21 = -8(y + 3)

Reorder the terms:
21 + -3y = -8(y + 3)

Reorder the terms:
21 + -3y = -8(3 + y)
21 + -3y = (3 * -8 + y * -8)
21 + -3y = (-24 + -8y)

Solving
21 + -3y = -24 + -8y

Solving for variable 'y'.

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

Add '8y' to each side of the equation.
21 + -3y + 8y = -24 + -8y + 8y

Combine like terms: -3y + 8y = 5y
21 + 5y = -24 + -8y + 8y

Combine like terms: -8y + 8y = 0
21 + 5y = -24 + 0
21 + 5y = -24

Add '-21' to each side of the equation.
21 + -21 + 5y = -24 + -21

Combine like terms: 21 + -21 = 0
0 + 5y = -24 + -21
5y = -24 + -21

Combine like terms: -24 + -21 = -45
5y = -45

Divide each side by '5'.
y = -9

Simplifying
y = -9

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