-3(y+1)=-9y+21

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Solution for -3(y+1)=-9y+21 equation:


Simplifying
-3(y + 1) = -9y + 21

Reorder the terms:
-3(1 + y) = -9y + 21
(1 * -3 + y * -3) = -9y + 21
(-3 + -3y) = -9y + 21

Reorder the terms:
-3 + -3y = 21 + -9y

Solving
-3 + -3y = 21 + -9y

Solving for variable 'y'.

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

Add '9y' to each side of the equation.
-3 + -3y + 9y = 21 + -9y + 9y

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

Combine like terms: -9y + 9y = 0
-3 + 6y = 21 + 0
-3 + 6y = 21

Add '3' to each side of the equation.
-3 + 3 + 6y = 21 + 3

Combine like terms: -3 + 3 = 0
0 + 6y = 21 + 3
6y = 21 + 3

Combine like terms: 21 + 3 = 24
6y = 24

Divide each side by '6'.
y = 4

Simplifying
y = 4

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